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Finding the Fourth Proportional to 20,478.66, 30,719.61 and 8,788.92

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Solution

The fourth proportional to 20,478.66, 30,719.61 and 8,788.92 is: 13,184.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.66 : 30,719.61 = 8,788.92 : x
  2. Step 2: Convert to fraction form
    20,478.66/30,719.61 = 8,788.92/x
  3. Step 3: Cross multiply
    20,478.66x = 30,719.61 × 8,788.92
  4. Step 4: Simplify right side
    20,478.66x = 269,992,194.72
  5. Step 5: Solve for x
    x = 269,992,194.72/20,478.66
  6. Step 6: Final answer
    x = 13,184.08

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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.