Home / 20,555.12-28,366.12-11,123.70

Finding the Fourth Proportional to 20,555.12, 28,366.12 and 11,123.70

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Solution

The fourth proportional to 20,555.12, 28,366.12 and 11,123.70 is: 15,350.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,555.12 : 28,366.12 = 11,123.70 : x
  2. Step 2: Convert to fraction form
    20,555.12/28,366.12 = 11,123.70/x
  3. Step 3: Cross multiply
    20,555.12x = 28,366.12 × 11,123.70
  4. Step 4: Simplify right side
    20,555.12x = 315,536,209.04
  5. Step 5: Solve for x
    x = 315,536,209.04/20,555.12
  6. Step 6: Final answer
    x = 15,350.74

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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.