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Finding the Fourth Proportional to 939.34, 1,294.95 and 658.72

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Solution

The fourth proportional to 939.34, 1,294.95 and 658.72 is: 908.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.34 : 1,294.95 = 658.72 : x
  2. Step 2: Convert to fraction form
    939.34/1,294.95 = 658.72/x
  3. Step 3: Cross multiply
    939.34x = 1,294.95 × 658.72
  4. Step 4: Simplify right side
    939.34x = 853,009.46
  5. Step 5: Solve for x
    x = 853,009.46/939.34
  6. Step 6: Final answer
    x = 908.09

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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.