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Finding the Fourth Proportional to 861.55, 1,189.34 and 551.23

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Solution

The fourth proportional to 861.55, 1,189.34 and 551.23 is: 760.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.55 : 1,189.34 = 551.23 : x
  2. Step 2: Convert to fraction form
    861.55/1,189.34 = 551.23/x
  3. Step 3: Cross multiply
    861.55x = 1,189.34 × 551.23
  4. Step 4: Simplify right side
    861.55x = 655,596.23
  5. Step 5: Solve for x
    x = 655,596.23/861.55
  6. Step 6: Final answer
    x = 760.95

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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.