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Finding the Fourth Proportional to 29,639.20, 40,913.40 and 20,220.52

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Solution

The fourth proportional to 29,639.20, 40,913.40 and 20,220.52 is: 27,912.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,639.20 : 40,913.40 = 20,220.52 : x
  2. Step 2: Convert to fraction form
    29,639.20/40,913.40 = 20,220.52/x
  3. Step 3: Cross multiply
    29,639.20x = 40,913.40 × 20,220.52
  4. Step 4: Simplify right side
    29,639.20x = 827,290,222.97
  5. Step 5: Solve for x
    x = 827,290,222.97/29,639.20
  6. Step 6: Final answer
    x = 27,912.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.