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Finding the Fourth Proportional to 72,909.88, 109,364.88 and 20,320.76

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Solution

The fourth proportional to 72,909.88, 109,364.88 and 20,320.76 is: 30,481.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,909.88 : 109,364.88 = 20,320.76 : x
  2. Step 2: Convert to fraction form
    72,909.88/109,364.88 = 20,320.76/x
  3. Step 3: Cross multiply
    72,909.88x = 109,364.88 × 20,320.76
  4. Step 4: Simplify right side
    72,909.88x = 2,222,377,478.91
  5. Step 5: Solve for x
    x = 2,222,377,478.91/72,909.88
  6. Step 6: Final answer
    x = 30,481.16

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1.5x scale

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.