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Finding the Fourth Proportional to 758.58, 1,139.15 and 719.61

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Solution

The fourth proportional to 758.58, 1,139.15 and 719.61 is: 1,080.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.58 : 1,139.15 = 719.61 : x
  2. Step 2: Convert to fraction form
    758.58/1,139.15 = 719.61/x
  3. Step 3: Cross multiply
    758.58x = 1,139.15 × 719.61
  4. Step 4: Simplify right side
    758.58x = 819,743.73
  5. Step 5: Solve for x
    x = 819,743.73/758.58
  6. Step 6: Final answer
    x = 1,080.63

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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.