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Finding the Fourth Proportional to 861.06, 1,186.56 and 805.44

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Solution

The fourth proportional to 861.06, 1,186.56 and 805.44 is: 1,109.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.06 : 1,186.56 = 805.44 : x
  2. Step 2: Convert to fraction form
    861.06/1,186.56 = 805.44/x
  3. Step 3: Cross multiply
    861.06x = 1,186.56 × 805.44
  4. Step 4: Simplify right side
    861.06x = 955,702.89
  5. Step 5: Solve for x
    x = 955,702.89/861.06
  6. Step 6: Final answer
    x = 1,109.91

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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.