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Finding the Fourth Proportional to 1,123.87, 1,684.31 and 862.87

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Solution

The fourth proportional to 1,123.87, 1,684.31 and 862.87 is: 1,293.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.87 : 1,684.31 = 862.87 : x
  2. Step 2: Convert to fraction form
    1,123.87/1,684.31 = 862.87/x
  3. Step 3: Cross multiply
    1,123.87x = 1,684.31 × 862.87
  4. Step 4: Simplify right side
    1,123.87x = 1,453,340.57
  5. Step 5: Solve for x
    x = 1,453,340.57/1,123.87
  6. Step 6: Final answer
    x = 1,293.16

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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.