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Finding the Fourth Proportional to 758.43, 1,138.46 and 325.89

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Solution

The fourth proportional to 758.43, 1,138.46 and 325.89 is: 489.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.43 : 1,138.46 = 325.89 : x
  2. Step 2: Convert to fraction form
    758.43/1,138.46 = 325.89/x
  3. Step 3: Cross multiply
    758.43x = 1,138.46 × 325.89
  4. Step 4: Simplify right side
    758.43x = 371,011.10
  5. Step 5: Solve for x
    x = 371,011.10/758.43
  6. Step 6: Final answer
    x = 489.18

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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.