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Finding the Fourth Proportional to 1,251.18, 1,726.38 and 778.95

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Solution

The fourth proportional to 1,251.18, 1,726.38 and 778.95 is: 1,074.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.18 : 1,726.38 = 778.95 : x
  2. Step 2: Convert to fraction form
    1,251.18/1,726.38 = 778.95/x
  3. Step 3: Cross multiply
    1,251.18x = 1,726.38 × 778.95
  4. Step 4: Simplify right side
    1,251.18x = 1,344,763.70
  5. Step 5: Solve for x
    x = 1,344,763.70/1,251.18
  6. Step 6: Final answer
    x = 1,074.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.