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Finding the Fourth Proportional to 863.10, 1,191.60 and 548.40

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Solution

The fourth proportional to 863.10, 1,191.60 and 548.40 is: 757.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.10 : 1,191.60 = 548.40 : x
  2. Step 2: Convert to fraction form
    863.10/1,191.60 = 548.40/x
  3. Step 3: Cross multiply
    863.10x = 1,191.60 × 548.40
  4. Step 4: Simplify right side
    863.10x = 653,473.44
  5. Step 5: Solve for x
    x = 653,473.44/863.10
  6. Step 6: Final answer
    x = 757.12

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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.