Home / 28,777.20-39,665.88-20,819.76

Finding the Fourth Proportional to 28,777.20, 39,665.88 and 20,819.76

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Solution

The fourth proportional to 28,777.20, 39,665.88 and 20,819.76 is: 28,697.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,777.20 : 39,665.88 = 20,819.76 : x
  2. Step 2: Convert to fraction form
    28,777.20/39,665.88 = 20,819.76/x
  3. Step 3: Cross multiply
    28,777.20x = 39,665.88 × 20,819.76
  4. Step 4: Simplify right side
    28,777.20x = 825,834,101.79
  5. Step 5: Solve for x
    x = 825,834,101.79/28,777.20
  6. Step 6: Final answer
    x = 28,697.51

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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.