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Finding the Fourth Proportional to 72,991.70, 109,487.55 and 20,401.10

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Solution

The fourth proportional to 72,991.70, 109,487.55 and 20,401.10 is: 30,601.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.70 : 109,487.55 = 20,401.10 : x
  2. Step 2: Convert to fraction form
    72,991.70/109,487.55 = 20,401.10/x
  3. Step 3: Cross multiply
    72,991.70x = 109,487.55 × 20,401.10
  4. Step 4: Simplify right side
    72,991.70x = 2,233,666,456.31
  5. Step 5: Solve for x
    x = 2,233,666,456.31/72,991.70
  6. Step 6: Final answer
    x = 30,601.65

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Similar ratio
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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.