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Finding the Fourth Proportional to 769.77, 1,152.19 and 613.95

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Solution

The fourth proportional to 769.77, 1,152.19 and 613.95 is: 918.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.77 : 1,152.19 = 613.95 : x
  2. Step 2: Convert to fraction form
    769.77/1,152.19 = 613.95/x
  3. Step 3: Cross multiply
    769.77x = 1,152.19 × 613.95
  4. Step 4: Simplify right side
    769.77x = 707,387.05
  5. Step 5: Solve for x
    x = 707,387.05/769.77
  6. Step 6: Final answer
    x = 918.96

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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.