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Finding the Fourth Proportional to 768.82, 1,153.68 and 281.91

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Solution

The fourth proportional to 768.82, 1,153.68 and 281.91 is: 423.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.82 : 1,153.68 = 281.91 : x
  2. Step 2: Convert to fraction form
    768.82/1,153.68 = 281.91/x
  3. Step 3: Cross multiply
    768.82x = 1,153.68 × 281.91
  4. Step 4: Simplify right side
    768.82x = 325,233.93
  5. Step 5: Solve for x
    x = 325,233.93/768.82
  6. Step 6: Final answer
    x = 423.03

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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.