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Finding the Fourth Proportional to 657.28, 985.60 and 315.04

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Solution

The fourth proportional to 657.28, 985.60 and 315.04 is: 472.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.28 : 985.60 = 315.04 : x
  2. Step 2: Convert to fraction form
    657.28/985.60 = 315.04/x
  3. Step 3: Cross multiply
    657.28x = 985.60 × 315.04
  4. Step 4: Simplify right side
    657.28x = 310,503.42
  5. Step 5: Solve for x
    x = 310,503.42/657.28
  6. Step 6: Final answer
    x = 472.41

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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.