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Finding the Fourth Proportional to 551.97, 762.71 and 478.17

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Solution

The fourth proportional to 551.97, 762.71 and 478.17 is: 660.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.97 : 762.71 = 478.17 : x
  2. Step 2: Convert to fraction form
    551.97/762.71 = 478.17/x
  3. Step 3: Cross multiply
    551.97x = 762.71 × 478.17
  4. Step 4: Simplify right side
    551.97x = 364,702.65
  5. Step 5: Solve for x
    x = 364,702.65/551.97
  6. Step 6: Final answer
    x = 660.73

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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.