Home / 20,618.81-30,943.40-13,939.55

Finding the Fourth Proportional to 20,618.81, 30,943.40 and 13,939.55

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Solution

The fourth proportional to 20,618.81, 30,943.40 and 13,939.55 is: 20,919.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618.81 : 30,943.40 = 13,939.55 : x
  2. Step 2: Convert to fraction form
    20,618.81/30,943.40 = 13,939.55/x
  3. Step 3: Cross multiply
    20,618.81x = 30,943.40 × 13,939.55
  4. Step 4: Simplify right side
    20,618.81x = 431,337,001.77
  5. Step 5: Solve for x
    x = 431,337,001.77/20,618.81
  6. Step 6: Final answer
    x = 20,919.59

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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.