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Finding the Fourth Proportional to 863.61, 1,191.47 and 553.29

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Solution

The fourth proportional to 863.61, 1,191.47 and 553.29 is: 763.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.61 : 1,191.47 = 553.29 : x
  2. Step 2: Convert to fraction form
    863.61/1,191.47 = 553.29/x
  3. Step 3: Cross multiply
    863.61x = 1,191.47 × 553.29
  4. Step 4: Simplify right side
    863.61x = 659,225.67
  5. Step 5: Solve for x
    x = 659,225.67/863.61
  6. Step 6: Final answer
    x = 763.34

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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.