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Finding the Fourth Proportional to 861.36, 1,187.97 and 625.32

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Solution

The fourth proportional to 861.36, 1,187.97 and 625.32 is: 862.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.36 : 1,187.97 = 625.32 : x
  2. Step 2: Convert to fraction form
    861.36/1,187.97 = 625.32/x
  3. Step 3: Cross multiply
    861.36x = 1,187.97 × 625.32
  4. Step 4: Simplify right side
    861.36x = 742,861.40
  5. Step 5: Solve for x
    x = 742,861.40/861.36
  6. Step 6: Final answer
    x = 862.43

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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.