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Finding the Fourth Proportional to 20,156.70, 30,235.05 and 15,491.10

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Solution

The fourth proportional to 20,156.70, 30,235.05 and 15,491.10 is: 23,236.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,156.70 : 30,235.05 = 15,491.10 : x
  2. Step 2: Convert to fraction form
    20,156.70/30,235.05 = 15,491.10/x
  3. Step 3: Cross multiply
    20,156.70x = 30,235.05 × 15,491.10
  4. Step 4: Simplify right side
    20,156.70x = 468,374,183.06
  5. Step 5: Solve for x
    x = 468,374,183.06/20,156.70
  6. Step 6: Final answer
    x = 23,236.65

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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.