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Finding the Fourth Proportional to 917.76, 1,373.76 and 712.92

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Solution

The fourth proportional to 917.76, 1,373.76 and 712.92 is: 1,067.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.76 : 1,373.76 = 712.92 : x
  2. Step 2: Convert to fraction form
    917.76/1,373.76 = 712.92/x
  3. Step 3: Cross multiply
    917.76x = 1,373.76 × 712.92
  4. Step 4: Simplify right side
    917.76x = 979,380.98
  5. Step 5: Solve for x
    x = 979,380.98/917.76
  6. Step 6: Final answer
    x = 1,067.14

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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.