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Finding the Fourth Proportional to 20,220.70, 30,331.05 and 10,356.70

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Solution

The fourth proportional to 20,220.70, 30,331.05 and 10,356.70 is: 15,535.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,220.70 : 30,331.05 = 10,356.70 : x
  2. Step 2: Convert to fraction form
    20,220.70/30,331.05 = 10,356.70/x
  3. Step 3: Cross multiply
    20,220.70x = 30,331.05 × 10,356.70
  4. Step 4: Simplify right side
    20,220.70x = 314,129,585.54
  5. Step 5: Solve for x
    x = 314,129,585.54/20,220.70
  6. Step 6: Final answer
    x = 15,535.05

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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.