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Finding the Fourth Proportional to 487.40, 731.46 and 397.22

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Solution

The fourth proportional to 487.40, 731.46 and 397.22 is: 596.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.40 : 731.46 = 397.22 : x
  2. Step 2: Convert to fraction form
    487.40/731.46 = 397.22/x
  3. Step 3: Cross multiply
    487.40x = 731.46 × 397.22
  4. Step 4: Simplify right side
    487.40x = 290,550.54
  5. Step 5: Solve for x
    x = 290,550.54/487.40
  6. Step 6: Final answer
    x = 596.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.