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Finding the Fourth Proportional to 717.90, 1,077.24 and 388.83

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Solution

The fourth proportional to 717.90, 1,077.24 and 388.83 is: 583.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.90 : 1,077.24 = 388.83 : x
  2. Step 2: Convert to fraction form
    717.90/1,077.24 = 388.83/x
  3. Step 3: Cross multiply
    717.90x = 1,077.24 × 388.83
  4. Step 4: Simplify right side
    717.90x = 418,868.73
  5. Step 5: Solve for x
    x = 418,868.73/717.90
  6. Step 6: Final answer
    x = 583.47

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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.