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Finding the Fourth Proportional to 530.32, 731.80 and 309.28

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Solution

The fourth proportional to 530.32, 731.80 and 309.28 is: 426.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.32 : 731.80 = 309.28 : x
  2. Step 2: Convert to fraction form
    530.32/731.80 = 309.28/x
  3. Step 3: Cross multiply
    530.32x = 731.80 × 309.28
  4. Step 4: Simplify right side
    530.32x = 226,331.10
  5. Step 5: Solve for x
    x = 226,331.10/530.32
  6. Step 6: Final answer
    x = 426.78

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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.