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Finding the Fourth Proportional to 1,666.12, 2,497.69 and 691.60

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Solution

The fourth proportional to 1,666.12, 2,497.69 and 691.60 is: 1,036.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.12 : 2,497.69 = 691.60 : x
  2. Step 2: Convert to fraction form
    1,666.12/2,497.69 = 691.60/x
  3. Step 3: Cross multiply
    1,666.12x = 2,497.69 × 691.60
  4. Step 4: Simplify right side
    1,666.12x = 1,727,402.40
  5. Step 5: Solve for x
    x = 1,727,402.40/1,666.12
  6. Step 6: Final answer
    x = 1,036.78

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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.