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Finding the Fourth Proportional to 861.62, 1,292.49 and 760.10

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Solution

The fourth proportional to 861.62, 1,292.49 and 760.10 is: 1,140.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.62 : 1,292.49 = 760.10 : x
  2. Step 2: Convert to fraction form
    861.62/1,292.49 = 760.10/x
  3. Step 3: Cross multiply
    861.62x = 1,292.49 × 760.10
  4. Step 4: Simplify right side
    861.62x = 982,415.19
  5. Step 5: Solve for x
    x = 982,415.19/861.62
  6. Step 6: Final answer
    x = 1,140.20

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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.