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Finding the Fourth Proportional to 862.78, 1,191.16 and 531.65

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Solution

The fourth proportional to 862.78, 1,191.16 and 531.65 is: 734.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.78 : 1,191.16 = 531.65 : x
  2. Step 2: Convert to fraction form
    862.78/1,191.16 = 531.65/x
  3. Step 3: Cross multiply
    862.78x = 1,191.16 × 531.65
  4. Step 4: Simplify right side
    862.78x = 633,280.21
  5. Step 5: Solve for x
    x = 633,280.21/862.78
  6. Step 6: Final answer
    x = 734.00

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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.