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Finding the Fourth Proportional to 861.56, 1,290.96 and 666.24

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Solution

The fourth proportional to 861.56, 1,290.96 and 666.24 is: 998.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.56 : 1,290.96 = 666.24 : x
  2. Step 2: Convert to fraction form
    861.56/1,290.96 = 666.24/x
  3. Step 3: Cross multiply
    861.56x = 1,290.96 × 666.24
  4. Step 4: Simplify right side
    861.56x = 860,089.19
  5. Step 5: Solve for x
    x = 860,089.19/861.56
  6. Step 6: Final answer
    x = 998.30

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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.