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Finding the Fourth Proportional to 982.86, 1,472.40 and 879.72

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Solution

The fourth proportional to 982.86, 1,472.40 and 879.72 is: 1,317.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.86 : 1,472.40 = 879.72 : x
  2. Step 2: Convert to fraction form
    982.86/1,472.40 = 879.72/x
  3. Step 3: Cross multiply
    982.86x = 1,472.40 × 879.72
  4. Step 4: Simplify right side
    982.86x = 1,295,299.73
  5. Step 5: Solve for x
    x = 1,295,299.73/982.86
  6. Step 6: Final answer
    x = 1,317.89

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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.