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Finding the Fourth Proportional to 976.80, 1,464.66 and 861.51

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Solution

The fourth proportional to 976.80, 1,464.66 and 861.51 is: 1,291.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.80 : 1,464.66 = 861.51 : x
  2. Step 2: Convert to fraction form
    976.80/1,464.66 = 861.51/x
  3. Step 3: Cross multiply
    976.80x = 1,464.66 × 861.51
  4. Step 4: Simplify right side
    976.80x = 1,261,819.24
  5. Step 5: Solve for x
    x = 1,261,819.24/976.80
  6. Step 6: Final answer
    x = 1,291.79

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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.