Home / 38,139.28-57,169.20-12,820

Finding the Fourth Proportional to 38,139.28, 57,169.20 and 12,820

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Solution

The fourth proportional to 38,139.28, 57,169.20 and 12,820 is: 19,216.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,139.28 : 57,169.20 = 12,820 : x
  2. Step 2: Convert to fraction form
    38,139.28/57,169.20 = 12,820/x
  3. Step 3: Cross multiply
    38,139.28x = 57,169.20 × 12,820
  4. Step 4: Simplify right side
    38,139.28x = 732,909,144
  5. Step 5: Solve for x
    x = 732,909,144/38,139.28
  6. Step 6: Final answer
    x = 19,216.65

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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.