Home / 20,581.52-28,379.95-13,398.18

Finding the Fourth Proportional to 20,581.52, 28,379.95 and 13,398.18

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Solution

The fourth proportional to 20,581.52, 28,379.95 and 13,398.18 is: 18,474.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,581.52 : 28,379.95 = 13,398.18 : x
  2. Step 2: Convert to fraction form
    20,581.52/28,379.95 = 13,398.18/x
  3. Step 3: Cross multiply
    20,581.52x = 28,379.95 × 13,398.18
  4. Step 4: Simplify right side
    20,581.52x = 380,239,711.97
  5. Step 5: Solve for x
    x = 380,239,711.97/20,581.52
  6. Step 6: Final answer
    x = 18,474.81

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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.