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Finding the Fourth Proportional to 658.14, 905.61 and 638.10

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Solution

The fourth proportional to 658.14, 905.61 and 638.10 is: 878.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.14 : 905.61 = 638.10 : x
  2. Step 2: Convert to fraction form
    658.14/905.61 = 638.10/x
  3. Step 3: Cross multiply
    658.14x = 905.61 × 638.10
  4. Step 4: Simplify right side
    658.14x = 577,869.74
  5. Step 5: Solve for x
    x = 577,869.74/658.14
  6. Step 6: Final answer
    x = 878.03

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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.