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Finding the Fourth Proportional to 749.43, 1,122.01 and 489.72

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Solution

The fourth proportional to 749.43, 1,122.01 and 489.72 is: 733.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.43 : 1,122.01 = 489.72 : x
  2. Step 2: Convert to fraction form
    749.43/1,122.01 = 489.72/x
  3. Step 3: Cross multiply
    749.43x = 1,122.01 × 489.72
  4. Step 4: Simplify right side
    749.43x = 549,470.74
  5. Step 5: Solve for x
    x = 549,470.74/749.43
  6. Step 6: Final answer
    x = 733.18

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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.