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Finding the Fourth Proportional to 866.60, 1,299.90 and 663.72

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Solution

The fourth proportional to 866.60, 1,299.90 and 663.72 is: 995.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.60 : 1,299.90 = 663.72 : x
  2. Step 2: Convert to fraction form
    866.60/1,299.90 = 663.72/x
  3. Step 3: Cross multiply
    866.60x = 1,299.90 × 663.72
  4. Step 4: Simplify right side
    866.60x = 862,769.63
  5. Step 5: Solve for x
    x = 862,769.63/866.60
  6. Step 6: Final answer
    x = 995.58

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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.