Home / 20,861.80-28,772.53-18,338.55

Finding the Fourth Proportional to 20,861.80, 28,772.53 and 18,338.55

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Solution

The fourth proportional to 20,861.80, 28,772.53 and 18,338.55 is: 25,292.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.80 : 28,772.53 = 18,338.55 : x
  2. Step 2: Convert to fraction form
    20,861.80/28,772.53 = 18,338.55/x
  3. Step 3: Cross multiply
    20,861.80x = 28,772.53 × 18,338.55
  4. Step 4: Simplify right side
    20,861.80x = 527,646,591.29
  5. Step 5: Solve for x
    x = 527,646,591.29/20,861.80
  6. Step 6: Final answer
    x = 25,292.47

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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.