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Finding the Fourth Proportional to 766.76, 1,147.76 and 546.70

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Solution

The fourth proportional to 766.76, 1,147.76 and 546.70 is: 818.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.76 : 1,147.76 = 546.70 : x
  2. Step 2: Convert to fraction form
    766.76/1,147.76 = 546.70/x
  3. Step 3: Cross multiply
    766.76x = 1,147.76 × 546.70
  4. Step 4: Simplify right side
    766.76x = 627,480.39
  5. Step 5: Solve for x
    x = 627,480.39/766.76
  6. Step 6: Final answer
    x = 818.35

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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.