Home / 20,921.20-28,861.52-13,363.68

Finding the Fourth Proportional to 20,921.20, 28,861.52 and 13,363.68

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Solution

The fourth proportional to 20,921.20, 28,861.52 and 13,363.68 is: 18,435.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.20 : 28,861.52 = 13,363.68 : x
  2. Step 2: Convert to fraction form
    20,921.20/28,861.52 = 13,363.68/x
  3. Step 3: Cross multiply
    20,921.20x = 28,861.52 × 13,363.68
  4. Step 4: Simplify right side
    20,921.20x = 385,696,117.59
  5. Step 5: Solve for x
    x = 385,696,117.59/20,921.20
  6. Step 6: Final answer
    x = 18,435.66

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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.