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Finding the Fourth Proportional to 866.58, 1,293.78 and 660.03

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Solution

The fourth proportional to 866.58, 1,293.78 and 660.03 is: 985.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.58 : 1,293.78 = 660.03 : x
  2. Step 2: Convert to fraction form
    866.58/1,293.78 = 660.03/x
  3. Step 3: Cross multiply
    866.58x = 1,293.78 × 660.03
  4. Step 4: Simplify right side
    866.58x = 853,933.61
  5. Step 5: Solve for x
    x = 853,933.61/866.58
  6. Step 6: Final answer
    x = 985.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.