Home / 38,486.40-57,778.20-20,731.20

Finding the Fourth Proportional to 38,486.40, 57,778.20 and 20,731.20

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Solution

The fourth proportional to 38,486.40, 57,778.20 and 20,731.20 is: 31,122.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,486.40 : 57,778.20 = 20,731.20 : x
  2. Step 2: Convert to fraction form
    38,486.40/57,778.20 = 20,731.20/x
  3. Step 3: Cross multiply
    38,486.40x = 57,778.20 × 20,731.20
  4. Step 4: Simplify right side
    38,486.40x = 1,197,811,419.84
  5. Step 5: Solve for x
    x = 1,197,811,419.84/38,486.40
  6. Step 6: Final answer
    x = 31,122.98

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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.