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Finding the Fourth Proportional to 920.97, 1,379.78 and 426.47

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Solution

The fourth proportional to 920.97, 1,379.78 and 426.47 is: 638.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.97 : 1,379.78 = 426.47 : x
  2. Step 2: Convert to fraction form
    920.97/1,379.78 = 426.47/x
  3. Step 3: Cross multiply
    920.97x = 1,379.78 × 426.47
  4. Step 4: Simplify right side
    920.97x = 588,429.74
  5. Step 5: Solve for x
    x = 588,429.74/920.97
  6. Step 6: Final answer
    x = 638.92

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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.