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Finding the Fourth Proportional to 758.55, 1,138.02 and 411.79

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Solution

The fourth proportional to 758.55, 1,138.02 and 411.79 is: 617.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.55 : 1,138.02 = 411.79 : x
  2. Step 2: Convert to fraction form
    758.55/1,138.02 = 411.79/x
  3. Step 3: Cross multiply
    758.55x = 1,138.02 × 411.79
  4. Step 4: Simplify right side
    758.55x = 468,624.62
  5. Step 5: Solve for x
    x = 468,624.62/758.55
  6. Step 6: Final answer
    x = 617.79

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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.