Home / 20,665.20-30,980.38-8,969.61

Finding the Fourth Proportional to 20,665.20, 30,980.38 and 8,969.61

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Solution

The fourth proportional to 20,665.20, 30,980.38 and 8,969.61 is: 13,446.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,665.20 : 30,980.38 = 8,969.61 : x
  2. Step 2: Convert to fraction form
    20,665.20/30,980.38 = 8,969.61/x
  3. Step 3: Cross multiply
    20,665.20x = 30,980.38 × 8,969.61
  4. Step 4: Simplify right side
    20,665.20x = 277,881,926.25
  5. Step 5: Solve for x
    x = 277,881,926.25/20,665.20
  6. Step 6: Final answer
    x = 13,446.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.