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Finding the Fourth Proportional to 861.12, 1,291.40 and 367.52

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Solution

The fourth proportional to 861.12, 1,291.40 and 367.52 is: 551.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.12 : 1,291.40 = 367.52 : x
  2. Step 2: Convert to fraction form
    861.12/1,291.40 = 367.52/x
  3. Step 3: Cross multiply
    861.12x = 1,291.40 × 367.52
  4. Step 4: Simplify right side
    861.12x = 474,615.33
  5. Step 5: Solve for x
    x = 474,615.33/861.12
  6. Step 6: Final answer
    x = 551.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.