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Finding the Fourth Proportional to 768.01, 1,151.67 and 280.72

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Solution

The fourth proportional to 768.01, 1,151.67 and 280.72 is: 420.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.01 : 1,151.67 = 280.72 : x
  2. Step 2: Convert to fraction form
    768.01/1,151.67 = 280.72/x
  3. Step 3: Cross multiply
    768.01x = 1,151.67 × 280.72
  4. Step 4: Simplify right side
    768.01x = 323,296.80
  5. Step 5: Solve for x
    x = 323,296.80/768.01
  6. Step 6: Final answer
    x = 420.95

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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.