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Finding the Fourth Proportional to 759.19, 1,138.80 and 239.18

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Solution

The fourth proportional to 759.19, 1,138.80 and 239.18 is: 358.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.19 : 1,138.80 = 239.18 : x
  2. Step 2: Convert to fraction form
    759.19/1,138.80 = 239.18/x
  3. Step 3: Cross multiply
    759.19x = 1,138.80 × 239.18
  4. Step 4: Simplify right side
    759.19x = 272,378.18
  5. Step 5: Solve for x
    x = 272,378.18/759.19
  6. Step 6: Final answer
    x = 358.77

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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.