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Finding the Fourth Proportional to 1,662, 2,493 and 688.13

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Solution

The fourth proportional to 1,662, 2,493 and 688.13 is: 1,032.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,662 : 2,493 = 688.13 : x
  2. Step 2: Convert to fraction form
    1,662/2,493 = 688.13/x
  3. Step 3: Cross multiply
    1,662x = 2,493 × 688.13
  4. Step 4: Simplify right side
    1,662x = 1,715,508.09
  5. Step 5: Solve for x
    x = 1,715,508.09/1,662
  6. Step 6: Final answer
    x = 1,032.20

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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.