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Finding the Fourth Proportional to 766.72, 1,151.70 and 651.16

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Solution

The fourth proportional to 766.72, 1,151.70 and 651.16 is: 978.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.72 : 1,151.70 = 651.16 : x
  2. Step 2: Convert to fraction form
    766.72/1,151.70 = 651.16/x
  3. Step 3: Cross multiply
    766.72x = 1,151.70 × 651.16
  4. Step 4: Simplify right side
    766.72x = 749,940.97
  5. Step 5: Solve for x
    x = 749,940.97/766.72
  6. Step 6: Final answer
    x = 978.12

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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.