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Finding the Fourth Proportional to 759.30, 1,139.12 and 239.27

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Solution

The fourth proportional to 759.30, 1,139.12 and 239.27 is: 358.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.30 : 1,139.12 = 239.27 : x
  2. Step 2: Convert to fraction form
    759.30/1,139.12 = 239.27/x
  3. Step 3: Cross multiply
    759.30x = 1,139.12 × 239.27
  4. Step 4: Simplify right side
    759.30x = 272,557.24
  5. Step 5: Solve for x
    x = 272,557.24/759.30
  6. Step 6: Final answer
    x = 358.96

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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.