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Finding the Fourth Proportional to 788.28, 1,178.76 and 702.12

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Solution

The fourth proportional to 788.28, 1,178.76 and 702.12 is: 1,049.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.28 : 1,178.76 = 702.12 : x
  2. Step 2: Convert to fraction form
    788.28/1,178.76 = 702.12/x
  3. Step 3: Cross multiply
    788.28x = 1,178.76 × 702.12
  4. Step 4: Simplify right side
    788.28x = 827,630.97
  5. Step 5: Solve for x
    x = 827,630.97/788.28
  6. Step 6: Final answer
    x = 1,049.92

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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.