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Finding the Fourth Proportional to 764.46, 1,147.38 and 489.72

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Solution

The fourth proportional to 764.46, 1,147.38 and 489.72 is: 735.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.46 : 1,147.38 = 489.72 : x
  2. Step 2: Convert to fraction form
    764.46/1,147.38 = 489.72/x
  3. Step 3: Cross multiply
    764.46x = 1,147.38 × 489.72
  4. Step 4: Simplify right side
    764.46x = 561,894.93
  5. Step 5: Solve for x
    x = 561,894.93/764.46
  6. Step 6: Final answer
    x = 735.02

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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.