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Finding the Fourth Proportional to 761.56, 1,139.02 and 679.88

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Solution

The fourth proportional to 761.56, 1,139.02 and 679.88 is: 1,016.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.56 : 1,139.02 = 679.88 : x
  2. Step 2: Convert to fraction form
    761.56/1,139.02 = 679.88/x
  3. Step 3: Cross multiply
    761.56x = 1,139.02 × 679.88
  4. Step 4: Simplify right side
    761.56x = 774,396.92
  5. Step 5: Solve for x
    x = 774,396.92/761.56
  6. Step 6: Final answer
    x = 1,016.86

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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.