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Finding the Fourth Proportional to 530.20, 731.52 and 309.10

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Solution

The fourth proportional to 530.20, 731.52 and 309.10 is: 426.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.20 : 731.52 = 309.10 : x
  2. Step 2: Convert to fraction form
    530.20/731.52 = 309.10/x
  3. Step 3: Cross multiply
    530.20x = 731.52 × 309.10
  4. Step 4: Simplify right side
    530.20x = 226,112.83
  5. Step 5: Solve for x
    x = 226,112.83/530.20
  6. Step 6: Final answer
    x = 426.47

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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.