Home / 20,819.58-28,721.19-15,139.74

Finding the Fourth Proportional to 20,819.58, 28,721.19 and 15,139.74

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Solution

The fourth proportional to 20,819.58, 28,721.19 and 15,139.74 is: 20,885.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.58 : 28,721.19 = 15,139.74 : x
  2. Step 2: Convert to fraction form
    20,819.58/28,721.19 = 15,139.74/x
  3. Step 3: Cross multiply
    20,819.58x = 28,721.19 × 15,139.74
  4. Step 4: Simplify right side
    20,819.58x = 434,831,349.09
  5. Step 5: Solve for x
    x = 434,831,349.09/20,819.58
  6. Step 6: Final answer
    x = 20,885.69

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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.