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Finding the Fourth Proportional to 861.25, 1,188.56 and 488.22

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Solution

The fourth proportional to 861.25, 1,188.56 and 488.22 is: 673.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.25 : 1,188.56 = 488.22 : x
  2. Step 2: Convert to fraction form
    861.25/1,188.56 = 488.22/x
  3. Step 3: Cross multiply
    861.25x = 1,188.56 × 488.22
  4. Step 4: Simplify right side
    861.25x = 580,282.61
  5. Step 5: Solve for x
    x = 580,282.61/861.25
  6. Step 6: Final answer
    x = 673.77

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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.