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Finding the Fourth Proportional to 697.75, 962.90 and 387.31

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Solution

The fourth proportional to 697.75, 962.90 and 387.31 is: 534.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.75 : 962.90 = 387.31 : x
  2. Step 2: Convert to fraction form
    697.75/962.90 = 387.31/x
  3. Step 3: Cross multiply
    697.75x = 962.90 × 387.31
  4. Step 4: Simplify right side
    697.75x = 372,938.86
  5. Step 5: Solve for x
    x = 372,938.86/697.75
  6. Step 6: Final answer
    x = 534.49

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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.