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Finding the Fourth Proportional to 531.12, 731.45 and 428.16

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Solution

The fourth proportional to 531.12, 731.45 and 428.16 is: 589.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.12 : 731.45 = 428.16 : x
  2. Step 2: Convert to fraction form
    531.12/731.45 = 428.16/x
  3. Step 3: Cross multiply
    531.12x = 731.45 × 428.16
  4. Step 4: Simplify right side
    531.12x = 313,178.70
  5. Step 5: Solve for x
    x = 313,178.70/531.12
  6. Step 6: Final answer
    x = 589.66

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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.