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Finding the Fourth Proportional to 20,791.86, 28,702.20 and 13,248.54

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Solution

The fourth proportional to 20,791.86, 28,702.20 and 13,248.54 is: 18,289.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.86 : 28,702.20 = 13,248.54 : x
  2. Step 2: Convert to fraction form
    20,791.86/28,702.20 = 13,248.54/x
  3. Step 3: Cross multiply
    20,791.86x = 28,702.20 × 13,248.54
  4. Step 4: Simplify right side
    20,791.86x = 380,262,244.79
  5. Step 5: Solve for x
    x = 380,262,244.79/20,791.86
  6. Step 6: Final answer
    x = 18,289.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.