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Finding the Fourth Proportional to 861.45, 1,189.89 and 749.20

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Solution

The fourth proportional to 861.45, 1,189.89 and 749.20 is: 1,034.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.45 : 1,189.89 = 749.20 : x
  2. Step 2: Convert to fraction form
    861.45/1,189.89 = 749.20/x
  3. Step 3: Cross multiply
    861.45x = 1,189.89 × 749.20
  4. Step 4: Simplify right side
    861.45x = 891,467.21
  5. Step 5: Solve for x
    x = 891,467.21/861.45
  6. Step 6: Final answer
    x = 1,034.84

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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.