Home / 20,139.18-30,208.56-12,243.88

Finding the Fourth Proportional to 20,139.18, 30,208.56 and 12,243.88

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Solution

The fourth proportional to 20,139.18, 30,208.56 and 12,243.88 is: 18,365.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.18 : 30,208.56 = 12,243.88 : x
  2. Step 2: Convert to fraction form
    20,139.18/30,208.56 = 12,243.88/x
  3. Step 3: Cross multiply
    20,139.18x = 30,208.56 × 12,243.88
  4. Step 4: Simplify right side
    20,139.18x = 369,869,983.61
  5. Step 5: Solve for x
    x = 369,869,983.61/20,139.18
  6. Step 6: Final answer
    x = 18,365.70

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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.