Home / 20,808.20-28,715.30-11,376.76

Finding the Fourth Proportional to 20,808.20, 28,715.30 and 11,376.76

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Solution

The fourth proportional to 20,808.20, 28,715.30 and 11,376.76 is: 15,699.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.20 : 28,715.30 = 11,376.76 : x
  2. Step 2: Convert to fraction form
    20,808.20/28,715.30 = 11,376.76/x
  3. Step 3: Cross multiply
    20,808.20x = 28,715.30 × 11,376.76
  4. Step 4: Simplify right side
    20,808.20x = 326,687,076.43
  5. Step 5: Solve for x
    x = 326,687,076.43/20,808.20
  6. Step 6: Final answer
    x = 15,699.92

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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.