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Finding the Fourth Proportional to 1,489.12, 2,233.86 and 611.92

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Solution

The fourth proportional to 1,489.12, 2,233.86 and 611.92 is: 917.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.12 : 2,233.86 = 611.92 : x
  2. Step 2: Convert to fraction form
    1,489.12/2,233.86 = 611.92/x
  3. Step 3: Cross multiply
    1,489.12x = 2,233.86 × 611.92
  4. Step 4: Simplify right side
    1,489.12x = 1,366,943.61
  5. Step 5: Solve for x
    x = 1,366,943.61/1,489.12
  6. Step 6: Final answer
    x = 917.95

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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.