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Finding the Fourth Proportional to 862.64, 1,187.64 and 686.96

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Solution

The fourth proportional to 862.64, 1,187.64 and 686.96 is: 945.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.64 : 1,187.64 = 686.96 : x
  2. Step 2: Convert to fraction form
    862.64/1,187.64 = 686.96/x
  3. Step 3: Cross multiply
    862.64x = 1,187.64 × 686.96
  4. Step 4: Simplify right side
    862.64x = 815,861.17
  5. Step 5: Solve for x
    x = 815,861.17/862.64
  6. Step 6: Final answer
    x = 945.77

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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.