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Finding the Fourth Proportional to 530.40, 731.96 and 309.36

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Solution

The fourth proportional to 530.40, 731.96 and 309.36 is: 426.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.40 : 731.96 = 309.36 : x
  2. Step 2: Convert to fraction form
    530.40/731.96 = 309.36/x
  3. Step 3: Cross multiply
    530.40x = 731.96 × 309.36
  4. Step 4: Simplify right side
    530.40x = 226,439.15
  5. Step 5: Solve for x
    x = 226,439.15/530.40
  6. Step 6: Final answer
    x = 426.92

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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.