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Finding the Fourth Proportional to 759.77, 1,139.17 and 321.31

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Solution

The fourth proportional to 759.77, 1,139.17 and 321.31 is: 481.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.77 : 1,139.17 = 321.31 : x
  2. Step 2: Convert to fraction form
    759.77/1,139.17 = 321.31/x
  3. Step 3: Cross multiply
    759.77x = 1,139.17 × 321.31
  4. Step 4: Simplify right side
    759.77x = 366,026.71
  5. Step 5: Solve for x
    x = 366,026.71/759.77
  6. Step 6: Final answer
    x = 481.76

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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.