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Finding the Fourth Proportional to 1,660.32, 2,490.78 and 686.50

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Solution

The fourth proportional to 1,660.32, 2,490.78 and 686.50 is: 1,029.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.32 : 2,490.78 = 686.50 : x
  2. Step 2: Convert to fraction form
    1,660.32/2,490.78 = 686.50/x
  3. Step 3: Cross multiply
    1,660.32x = 2,490.78 × 686.50
  4. Step 4: Simplify right side
    1,660.32x = 1,709,914.24
  5. Step 5: Solve for x
    x = 1,709,914.24/1,660.32
  6. Step 6: Final answer
    x = 1,029.87

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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.