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Finding the Fourth Proportional to 55,238.80, 82,836.60 and 20,160.40

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Solution

The fourth proportional to 55,238.80, 82,836.60 and 20,160.40 is: 30,232.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,238.80 : 82,836.60 = 20,160.40 : x
  2. Step 2: Convert to fraction form
    55,238.80/82,836.60 = 20,160.40/x
  3. Step 3: Cross multiply
    55,238.80x = 82,836.60 × 20,160.40
  4. Step 4: Simplify right side
    55,238.80x = 1,670,018,990.64
  5. Step 5: Solve for x
    x = 1,670,018,990.64/55,238.80
  6. Step 6: Final answer
    x = 30,232.72

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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.