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Finding the Fourth Proportional to 72,879.68, 109,442.40 and 69,138.56

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Solution

The fourth proportional to 72,879.68, 109,442.40 and 69,138.56 is: 103,824.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,879.68 : 109,442.40 = 69,138.56 : x
  2. Step 2: Convert to fraction form
    72,879.68/109,442.40 = 69,138.56/x
  3. Step 3: Cross multiply
    72,879.68x = 109,442.40 × 69,138.56
  4. Step 4: Simplify right side
    72,879.68x = 7,566,689,938.94
  5. Step 5: Solve for x
    x = 7,566,689,938.94/72,879.68
  6. Step 6: Final answer
    x = 103,824.41

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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.