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Finding the Fourth Proportional to 939.12, 1,294.61 and 658.51

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Solution

The fourth proportional to 939.12, 1,294.61 and 658.51 is: 907.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.12 : 1,294.61 = 658.51 : x
  2. Step 2: Convert to fraction form
    939.12/1,294.61 = 658.51/x
  3. Step 3: Cross multiply
    939.12x = 1,294.61 × 658.51
  4. Step 4: Simplify right side
    939.12x = 852,513.66
  5. Step 5: Solve for x
    x = 852,513.66/939.12
  6. Step 6: Final answer
    x = 907.78

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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.