Home / 20,561.18-28,374.45-11,129.72

Finding the Fourth Proportional to 20,561.18, 28,374.45 and 11,129.72

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Solution

The fourth proportional to 20,561.18, 28,374.45 and 11,129.72 is: 15,359.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.18 : 28,374.45 = 11,129.72 : x
  2. Step 2: Convert to fraction form
    20,561.18/28,374.45 = 11,129.72/x
  3. Step 3: Cross multiply
    20,561.18x = 28,374.45 × 11,129.72
  4. Step 4: Simplify right side
    20,561.18x = 315,799,683.65
  5. Step 5: Solve for x
    x = 315,799,683.65/20,561.18
  6. Step 6: Final answer
    x = 15,359.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.