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Finding the Fourth Proportional to 749.01, 1,122.72 and 489.21

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Solution

The fourth proportional to 749.01, 1,122.72 and 489.21 is: 733.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.01 : 1,122.72 = 489.21 : x
  2. Step 2: Convert to fraction form
    749.01/1,122.72 = 489.21/x
  3. Step 3: Cross multiply
    749.01x = 1,122.72 × 489.21
  4. Step 4: Simplify right side
    749.01x = 549,245.85
  5. Step 5: Solve for x
    x = 549,245.85/749.01
  6. Step 6: Final answer
    x = 733.30

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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.