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Finding the Fourth Proportional to 917.97, 1,376.10 and 687.86

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Solution

The fourth proportional to 917.97, 1,376.10 and 687.86 is: 1,031.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.97 : 1,376.10 = 687.86 : x
  2. Step 2: Convert to fraction form
    917.97/1,376.10 = 687.86/x
  3. Step 3: Cross multiply
    917.97x = 1,376.10 × 687.86
  4. Step 4: Simplify right side
    917.97x = 946,557.27
  5. Step 5: Solve for x
    x = 946,557.27/917.97
  6. Step 6: Final answer
    x = 1,031.14

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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.