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Finding the Fourth Proportional to 1,251.88, 1,728.42 and 780.46

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Solution

The fourth proportional to 1,251.88, 1,728.42 and 780.46 is: 1,077.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.88 : 1,728.42 = 780.46 : x
  2. Step 2: Convert to fraction form
    1,251.88/1,728.42 = 780.46/x
  3. Step 3: Cross multiply
    1,251.88x = 1,728.42 × 780.46
  4. Step 4: Simplify right side
    1,251.88x = 1,348,962.67
  5. Step 5: Solve for x
    x = 1,348,962.67/1,251.88
  6. Step 6: Final answer
    x = 1,077.55

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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.