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Finding the Fourth Proportional to 768.18, 1,151.57 and 280.89

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Solution

The fourth proportional to 768.18, 1,151.57 and 280.89 is: 421.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.18 : 1,151.57 = 280.89 : x
  2. Step 2: Convert to fraction form
    768.18/1,151.57 = 280.89/x
  3. Step 3: Cross multiply
    768.18x = 1,151.57 × 280.89
  4. Step 4: Simplify right side
    768.18x = 323,463.09
  5. Step 5: Solve for x
    x = 323,463.09/768.18
  6. Step 6: Final answer
    x = 421.08

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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.