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Finding the Fourth Proportional to 1,108.92, 1,660.82 and 760.76

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Solution

The fourth proportional to 1,108.92, 1,660.82 and 760.76 is: 1,139.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.92 : 1,660.82 = 760.76 : x
  2. Step 2: Convert to fraction form
    1,108.92/1,660.82 = 760.76/x
  3. Step 3: Cross multiply
    1,108.92x = 1,660.82 × 760.76
  4. Step 4: Simplify right side
    1,108.92x = 1,263,485.42
  5. Step 5: Solve for x
    x = 1,263,485.42/1,108.92
  6. Step 6: Final answer
    x = 1,139.38

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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.