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Finding the Fourth Proportional to 20,479.68, 30,780.16 and 16,992.32

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Solution

The fourth proportional to 20,479.68, 30,780.16 and 16,992.32 is: 25,538.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.68 : 30,780.16 = 16,992.32 : x
  2. Step 2: Convert to fraction form
    20,479.68/30,780.16 = 16,992.32/x
  3. Step 3: Cross multiply
    20,479.68x = 30,780.16 × 16,992.32
  4. Step 4: Simplify right side
    20,479.68x = 523,026,328.37
  5. Step 5: Solve for x
    x = 523,026,328.37/20,479.68
  6. Step 6: Final answer
    x = 25,538.79

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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.