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Finding the Fourth Proportional to 766.64, 1,147.65 and 492.15

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Solution

The fourth proportional to 766.64, 1,147.65 and 492.15 is: 736.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.64 : 1,147.65 = 492.15 : x
  2. Step 2: Convert to fraction form
    766.64/1,147.65 = 492.15/x
  3. Step 3: Cross multiply
    766.64x = 1,147.65 × 492.15
  4. Step 4: Simplify right side
    766.64x = 564,811.95
  5. Step 5: Solve for x
    x = 564,811.95/766.64
  6. Step 6: Final answer
    x = 736.74

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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.