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Finding the Fourth Proportional to 861.18, 1,186.47 and 823.74

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Solution

The fourth proportional to 861.18, 1,186.47 and 823.74 is: 1,134.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.18 : 1,186.47 = 823.74 : x
  2. Step 2: Convert to fraction form
    861.18/1,186.47 = 823.74/x
  3. Step 3: Cross multiply
    861.18x = 1,186.47 × 823.74
  4. Step 4: Simplify right side
    861.18x = 977,342.80
  5. Step 5: Solve for x
    x = 977,342.80/861.18
  6. Step 6: Final answer
    x = 1,134.89

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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.