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Finding the Fourth Proportional to 769.78, 1,153.95 and 282.70

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Solution

The fourth proportional to 769.78, 1,153.95 and 282.70 is: 423.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.78 : 1,153.95 = 282.70 : x
  2. Step 2: Convert to fraction form
    769.78/1,153.95 = 282.70/x
  3. Step 3: Cross multiply
    769.78x = 1,153.95 × 282.70
  4. Step 4: Simplify right side
    769.78x = 326,221.67
  5. Step 5: Solve for x
    x = 326,221.67/769.78
  6. Step 6: Final answer
    x = 423.79

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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.