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Finding the Fourth Proportional to 769.69, 1,061.26 and 621.87

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Solution

The fourth proportional to 769.69, 1,061.26 and 621.87 is: 857.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.69 : 1,061.26 = 621.87 : x
  2. Step 2: Convert to fraction form
    769.69/1,061.26 = 621.87/x
  3. Step 3: Cross multiply
    769.69x = 1,061.26 × 621.87
  4. Step 4: Simplify right side
    769.69x = 659,965.76
  5. Step 5: Solve for x
    x = 659,965.76/769.69
  6. Step 6: Final answer
    x = 857.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.