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Finding the Fourth Proportional to 72,919.74, 109,380.08 and 20,329.68

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Solution

The fourth proportional to 72,919.74, 109,380.08 and 20,329.68 is: 30,494.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,919.74 : 109,380.08 = 20,329.68 : x
  2. Step 2: Convert to fraction form
    72,919.74/109,380.08 = 20,329.68/x
  3. Step 3: Cross multiply
    72,919.74x = 109,380.08 × 20,329.68
  4. Step 4: Simplify right side
    72,919.74x = 2,223,662,024.77
  5. Step 5: Solve for x
    x = 2,223,662,024.77/72,919.74
  6. Step 6: Final answer
    x = 30,494.65

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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.