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Finding the Fourth Proportional to 20,561.88, 30,842.90 and 4,979.52

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Solution

The fourth proportional to 20,561.88, 30,842.90 and 4,979.52 is: 7,469.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.88 : 30,842.90 = 4,979.52 : x
  2. Step 2: Convert to fraction form
    20,561.88/30,842.90 = 4,979.52/x
  3. Step 3: Cross multiply
    20,561.88x = 30,842.90 × 4,979.52
  4. Step 4: Simplify right side
    20,561.88x = 153,582,837.41
  5. Step 5: Solve for x
    x = 153,582,837.41/20,561.88
  6. Step 6: Final answer
    x = 7,469.30

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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.