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Finding the Fourth Proportional to 1,127.44, 1,691.70 and 981.46

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Solution

The fourth proportional to 1,127.44, 1,691.70 and 981.46 is: 1,472.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.44 : 1,691.70 = 981.46 : x
  2. Step 2: Convert to fraction form
    1,127.44/1,691.70 = 981.46/x
  3. Step 3: Cross multiply
    1,127.44x = 1,691.70 × 981.46
  4. Step 4: Simplify right side
    1,127.44x = 1,660,335.88
  5. Step 5: Solve for x
    x = 1,660,335.88/1,127.44
  6. Step 6: Final answer
    x = 1,472.66

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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.