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Finding the Fourth Proportional to 726.75, 1,007.14 and 712.90

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Solution

The fourth proportional to 726.75, 1,007.14 and 712.90 is: 987.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.75 : 1,007.14 = 712.90 : x
  2. Step 2: Convert to fraction form
    726.75/1,007.14 = 712.90/x
  3. Step 3: Cross multiply
    726.75x = 1,007.14 × 712.90
  4. Step 4: Simplify right side
    726.75x = 717,991.89
  5. Step 5: Solve for x
    x = 717,991.89/726.75
  6. Step 6: Final answer
    x = 987.95

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.