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Finding the Fourth Proportional to 1,660.59, 2,491.47 and 686.79

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Solution

The fourth proportional to 1,660.59, 2,491.47 and 686.79 is: 1,030.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.59 : 2,491.47 = 686.79 : x
  2. Step 2: Convert to fraction form
    1,660.59/2,491.47 = 686.79/x
  3. Step 3: Cross multiply
    1,660.59x = 2,491.47 × 686.79
  4. Step 4: Simplify right side
    1,660.59x = 1,711,116.68
  5. Step 5: Solve for x
    x = 1,711,116.68/1,660.59
  6. Step 6: Final answer
    x = 1,030.43

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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.