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Finding the Fourth Proportional to 1,125.24, 1,686.02 and 712.72

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Solution

The fourth proportional to 1,125.24, 1,686.02 and 712.72 is: 1,067.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.24 : 1,686.02 = 712.72 : x
  2. Step 2: Convert to fraction form
    1,125.24/1,686.02 = 712.72/x
  3. Step 3: Cross multiply
    1,125.24x = 1,686.02 × 712.72
  4. Step 4: Simplify right side
    1,125.24x = 1,201,660.17
  5. Step 5: Solve for x
    x = 1,201,660.17/1,125.24
  6. Step 6: Final answer
    x = 1,067.91

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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.