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Finding the Fourth Proportional to 658.31, 985.70 and 580.46

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Solution

The fourth proportional to 658.31, 985.70 and 580.46 is: 869.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.31 : 985.70 = 580.46 : x
  2. Step 2: Convert to fraction form
    658.31/985.70 = 580.46/x
  3. Step 3: Cross multiply
    658.31x = 985.70 × 580.46
  4. Step 4: Simplify right side
    658.31x = 572,155.94
  5. Step 5: Solve for x
    x = 572,155.94/658.31
  6. Step 6: Final answer
    x = 869.14

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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.