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Finding the Fourth Proportional to 904.32, 1,248.16 and 555.20

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Solution

The fourth proportional to 904.32, 1,248.16 and 555.20 is: 766.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.32 : 1,248.16 = 555.20 : x
  2. Step 2: Convert to fraction form
    904.32/1,248.16 = 555.20/x
  3. Step 3: Cross multiply
    904.32x = 1,248.16 × 555.20
  4. Step 4: Simplify right side
    904.32x = 692,978.43
  5. Step 5: Solve for x
    x = 692,978.43/904.32
  6. Step 6: Final answer
    x = 766.30

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Half scale
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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.