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Finding the Fourth Proportional to 1,660.80, 2,491.20 and 686.92

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Solution

The fourth proportional to 1,660.80, 2,491.20 and 686.92 is: 1,030.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.80 : 2,491.20 = 686.92 : x
  2. Step 2: Convert to fraction form
    1,660.80/2,491.20 = 686.92/x
  3. Step 3: Cross multiply
    1,660.80x = 2,491.20 × 686.92
  4. Step 4: Simplify right side
    1,660.80x = 1,711,255.10
  5. Step 5: Solve for x
    x = 1,711,255.10/1,660.80
  6. Step 6: Final answer
    x = 1,030.38

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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.