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Finding the Fourth Proportional to 1,686.72, 2,540 and 1,472.88

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Solution

The fourth proportional to 1,686.72, 2,540 and 1,472.88 is: 2,217.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.72 : 2,540 = 1,472.88 : x
  2. Step 2: Convert to fraction form
    1,686.72/2,540 = 1,472.88/x
  3. Step 3: Cross multiply
    1,686.72x = 2,540 × 1,472.88
  4. Step 4: Simplify right side
    1,686.72x = 3,741,115.20
  5. Step 5: Solve for x
    x = 3,741,115.20/1,686.72
  6. Step 6: Final answer
    x = 2,217.98

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.