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Finding the Fourth Proportional to 1,277.98, 1,915.56 and 728.95

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Solution

The fourth proportional to 1,277.98, 1,915.56 and 728.95 is: 1,092.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.98 : 1,915.56 = 728.95 : x
  2. Step 2: Convert to fraction form
    1,277.98/1,915.56 = 728.95/x
  3. Step 3: Cross multiply
    1,277.98x = 1,915.56 × 728.95
  4. Step 4: Simplify right side
    1,277.98x = 1,396,347.46
  5. Step 5: Solve for x
    x = 1,396,347.46/1,277.98
  6. Step 6: Final answer
    x = 1,092.62

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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.