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Finding the Fourth Proportional to 775.71, 1,169.70 and 761.13

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Solution

The fourth proportional to 775.71, 1,169.70 and 761.13 is: 1,147.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.71 : 1,169.70 = 761.13 : x
  2. Step 2: Convert to fraction form
    775.71/1,169.70 = 761.13/x
  3. Step 3: Cross multiply
    775.71x = 1,169.70 × 761.13
  4. Step 4: Simplify right side
    775.71x = 890,293.76
  5. Step 5: Solve for x
    x = 890,293.76/775.71
  6. Step 6: Final answer
    x = 1,147.71

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.