Home / 20,747.68-31,121.38-12,430.06

Finding the Fourth Proportional to 20,747.68, 31,121.38 and 12,430.06

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Solution

The fourth proportional to 20,747.68, 31,121.38 and 12,430.06 is: 18,645.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,747.68 : 31,121.38 = 12,430.06 : x
  2. Step 2: Convert to fraction form
    20,747.68/31,121.38 = 12,430.06/x
  3. Step 3: Cross multiply
    20,747.68x = 31,121.38 × 12,430.06
  4. Step 4: Simplify right side
    20,747.68x = 386,840,620.68
  5. Step 5: Solve for x
    x = 386,840,620.68/20,747.68
  6. Step 6: Final answer
    x = 18,645.01

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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.