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Finding the Fourth Proportional to 906.10, 1,359.15 and 861.55

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Solution

The fourth proportional to 906.10, 1,359.15 and 861.55 is: 1,292.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.10 : 1,359.15 = 861.55 : x
  2. Step 2: Convert to fraction form
    906.10/1,359.15 = 861.55/x
  3. Step 3: Cross multiply
    906.10x = 1,359.15 × 861.55
  4. Step 4: Simplify right side
    906.10x = 1,170,975.68
  5. Step 5: Solve for x
    x = 1,170,975.68/906.10
  6. Step 6: Final answer
    x = 1,292.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.