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Finding the Fourth Proportional to 402,471.16, 555,420.42 and 221,187.69

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Solution

The fourth proportional to 402,471.16, 555,420.42 and 221,187.69 is: 305,244.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,471.16 : 555,420.42 = 221,187.69 : x
  2. Step 2: Convert to fraction form
    402,471.16/555,420.42 = 221,187.69/x
  3. Step 3: Cross multiply
    402,471.16x = 555,420.42 × 221,187.69
  4. Step 4: Simplify right side
    402,471.16x = 122,852,159,678.63
  5. Step 5: Solve for x
    x = 122,852,159,678.63/402,471.16
  6. Step 6: Final answer
    x = 305,244.63

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Double scale
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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.