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Finding the Fourth Proportional to 759.10, 1,138.65 and 239.11

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Solution

The fourth proportional to 759.10, 1,138.65 and 239.11 is: 358.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.10 : 1,138.65 = 239.11 : x
  2. Step 2: Convert to fraction form
    759.10/1,138.65 = 239.11/x
  3. Step 3: Cross multiply
    759.10x = 1,138.65 × 239.11
  4. Step 4: Simplify right side
    759.10x = 272,262.60
  5. Step 5: Solve for x
    x = 272,262.60/759.10
  6. Step 6: Final answer
    x = 358.67

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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.