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Finding the Fourth Proportional to 1,248.68, 1,871.61 and 760.66

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Solution

The fourth proportional to 1,248.68, 1,871.61 and 760.66 is: 1,140.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.68 : 1,871.61 = 760.66 : x
  2. Step 2: Convert to fraction form
    1,248.68/1,871.61 = 760.66/x
  3. Step 3: Cross multiply
    1,248.68x = 1,871.61 × 760.66
  4. Step 4: Simplify right side
    1,248.68x = 1,423,658.86
  5. Step 5: Solve for x
    x = 1,423,658.86/1,248.68
  6. Step 6: Final answer
    x = 1,140.13

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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.