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Finding the Fourth Proportional to 72,991.80, 109,474.20 and 20,390.40

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Solution

The fourth proportional to 72,991.80, 109,474.20 and 20,390.40 is: 30,581.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.80 : 109,474.20 = 20,390.40 : x
  2. Step 2: Convert to fraction form
    72,991.80/109,474.20 = 20,390.40/x
  3. Step 3: Cross multiply
    72,991.80x = 109,474.20 × 20,390.40
  4. Step 4: Simplify right side
    72,991.80x = 2,232,222,727.68
  5. Step 5: Solve for x
    x = 2,232,222,727.68/72,991.80
  6. Step 6: Final answer
    x = 30,581.83

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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.