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Finding the Fourth Proportional to 769.16, 1,152.78 and 711.80

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Solution

The fourth proportional to 769.16, 1,152.78 and 711.80 is: 1,066.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.16 : 1,152.78 = 711.80 : x
  2. Step 2: Convert to fraction form
    769.16/1,152.78 = 711.80/x
  3. Step 3: Cross multiply
    769.16x = 1,152.78 × 711.80
  4. Step 4: Simplify right side
    769.16x = 820,548.80
  5. Step 5: Solve for x
    x = 820,548.80/769.16
  6. Step 6: Final answer
    x = 1,066.81

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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.