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Finding the Fourth Proportional to 865.89, 1,191.78 and 755.73

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Solution

The fourth proportional to 865.89, 1,191.78 and 755.73 is: 1,040.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.89 : 1,191.78 = 755.73 : x
  2. Step 2: Convert to fraction form
    865.89/1,191.78 = 755.73/x
  3. Step 3: Cross multiply
    865.89x = 1,191.78 × 755.73
  4. Step 4: Simplify right side
    865.89x = 900,663.90
  5. Step 5: Solve for x
    x = 900,663.90/865.89
  6. Step 6: Final answer
    x = 1,040.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.