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Finding the Fourth Proportional to 21,979.20, 32,920.20 and 13,231.20

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Solution

The fourth proportional to 21,979.20, 32,920.20 and 13,231.20 is: 19,817.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.20 : 32,920.20 = 13,231.20 : x
  2. Step 2: Convert to fraction form
    21,979.20/32,920.20 = 13,231.20/x
  3. Step 3: Cross multiply
    21,979.20x = 32,920.20 × 13,231.20
  4. Step 4: Simplify right side
    21,979.20x = 435,573,750.24
  5. Step 5: Solve for x
    x = 435,573,750.24/21,979.20
  6. Step 6: Final answer
    x = 19,817.54

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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.