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Finding the Fourth Proportional to 769.70, 1,152.20 and 751.08

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Solution

The fourth proportional to 769.70, 1,152.20 and 751.08 is: 1,124.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.70 : 1,152.20 = 751.08 : x
  2. Step 2: Convert to fraction form
    769.70/1,152.20 = 751.08/x
  3. Step 3: Cross multiply
    769.70x = 1,152.20 × 751.08
  4. Step 4: Simplify right side
    769.70x = 865,394.38
  5. Step 5: Solve for x
    x = 865,394.38/769.70
  6. Step 6: Final answer
    x = 1,124.33

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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.