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Finding the Fourth Proportional to 1,471.78, 2,207.14 and 691.64

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Solution

The fourth proportional to 1,471.78, 2,207.14 and 691.64 is: 1,037.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,471.78 : 2,207.14 = 691.64 : x
  2. Step 2: Convert to fraction form
    1,471.78/2,207.14 = 691.64/x
  3. Step 3: Cross multiply
    1,471.78x = 2,207.14 × 691.64
  4. Step 4: Simplify right side
    1,471.78x = 1,526,546.31
  5. Step 5: Solve for x
    x = 1,526,546.31/1,471.78
  6. Step 6: Final answer
    x = 1,037.21

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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.