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Finding the Fourth Proportional to 863.76, 1,191.49 and 548.40

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Solution

The fourth proportional to 863.76, 1,191.49 and 548.40 is: 756.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.76 : 1,191.49 = 548.40 : x
  2. Step 2: Convert to fraction form
    863.76/1,191.49 = 548.40/x
  3. Step 3: Cross multiply
    863.76x = 1,191.49 × 548.40
  4. Step 4: Simplify right side
    863.76x = 653,413.12
  5. Step 5: Solve for x
    x = 653,413.12/863.76
  6. Step 6: Final answer
    x = 756.48

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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.