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Finding the Fourth Proportional to 767.70, 1,151.55 and 728.10

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Solution

The fourth proportional to 767.70, 1,151.55 and 728.10 is: 1,092.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.70 : 1,151.55 = 728.10 : x
  2. Step 2: Convert to fraction form
    767.70/1,151.55 = 728.10/x
  3. Step 3: Cross multiply
    767.70x = 1,151.55 × 728.10
  4. Step 4: Simplify right side
    767.70x = 838,443.56
  5. Step 5: Solve for x
    x = 838,443.56/767.70
  6. Step 6: Final answer
    x = 1,092.15

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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.