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Finding the Fourth Proportional to 1,125.64, 1,691.28 and 714.94

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Solution

The fourth proportional to 1,125.64, 1,691.28 and 714.94 is: 1,074.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.64 : 1,691.28 = 714.94 : x
  2. Step 2: Convert to fraction form
    1,125.64/1,691.28 = 714.94/x
  3. Step 3: Cross multiply
    1,125.64x = 1,691.28 × 714.94
  4. Step 4: Simplify right side
    1,125.64x = 1,209,163.72
  5. Step 5: Solve for x
    x = 1,209,163.72/1,125.64
  6. Step 6: Final answer
    x = 1,074.20

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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.