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Finding the Fourth Proportional to 20,678.91, 30,979.20 and 12,220.11

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Solution

The fourth proportional to 20,678.91, 30,979.20 and 12,220.11 is: 18,307.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,678.91 : 30,979.20 = 12,220.11 : x
  2. Step 2: Convert to fraction form
    20,678.91/30,979.20 = 12,220.11/x
  3. Step 3: Cross multiply
    20,678.91x = 30,979.20 × 12,220.11
  4. Step 4: Simplify right side
    20,678.91x = 378,569,231.71
  5. Step 5: Solve for x
    x = 378,569,231.71/20,678.91
  6. Step 6: Final answer
    x = 18,307.02

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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.