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Finding the Fourth Proportional to 657.10, 986.34 and 397.74

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Solution

The fourth proportional to 657.10, 986.34 and 397.74 is: 597.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.10 : 986.34 = 397.74 : x
  2. Step 2: Convert to fraction form
    657.10/986.34 = 397.74/x
  3. Step 3: Cross multiply
    657.10x = 986.34 × 397.74
  4. Step 4: Simplify right side
    657.10x = 392,306.87
  5. Step 5: Solve for x
    x = 392,306.87/657.10
  6. Step 6: Final answer
    x = 597.03

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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.