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Finding the Fourth Proportional to 1,665.54, 2,498.31 and 691.38

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Solution

The fourth proportional to 1,665.54, 2,498.31 and 691.38 is: 1,037.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,665.54 : 2,498.31 = 691.38 : x
  2. Step 2: Convert to fraction form
    1,665.54/2,498.31 = 691.38/x
  3. Step 3: Cross multiply
    1,665.54x = 2,498.31 × 691.38
  4. Step 4: Simplify right side
    1,665.54x = 1,727,281.57
  5. Step 5: Solve for x
    x = 1,727,281.57/1,665.54
  6. Step 6: Final answer
    x = 1,037.07

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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.