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Finding the Fourth Proportional to 402,608.75, 555,607.10 and 221,328.32

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Solution

The fourth proportional to 402,608.75, 555,607.10 and 221,328.32 is: 305,436.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,608.75 : 555,607.10 = 221,328.32 : x
  2. Step 2: Convert to fraction form
    402,608.75/555,607.10 = 221,328.32/x
  3. Step 3: Cross multiply
    402,608.75x = 555,607.10 × 221,328.32
  4. Step 4: Simplify right side
    402,608.75x = 122,971,586,023.07
  5. Step 5: Solve for x
    x = 122,971,586,023.07/402,608.75
  6. Step 6: Final answer
    x = 305,436.94

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.