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Finding the Fourth Proportional to 861.03, 1,292.15 and 666.47

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Solution

The fourth proportional to 861.03, 1,292.15 and 666.47 is: 1,000.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.03 : 1,292.15 = 666.47 : x
  2. Step 2: Convert to fraction form
    861.03/1,292.15 = 666.47/x
  3. Step 3: Cross multiply
    861.03x = 1,292.15 × 666.47
  4. Step 4: Simplify right side
    861.03x = 861,175.88
  5. Step 5: Solve for x
    x = 861,175.88/861.03
  6. Step 6: Final answer
    x = 1,000.18

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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.