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Finding the Fourth Proportional to 20,061.70, 30,078.68 and 8,811.61

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Solution

The fourth proportional to 20,061.70, 30,078.68 and 8,811.61 is: 13,211.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,061.70 : 30,078.68 = 8,811.61 : x
  2. Step 2: Convert to fraction form
    20,061.70/30,078.68 = 8,811.61/x
  3. Step 3: Cross multiply
    20,061.70x = 30,078.68 × 8,811.61
  4. Step 4: Simplify right side
    20,061.70x = 265,041,478.22
  5. Step 5: Solve for x
    x = 265,041,478.22/20,061.70
  6. Step 6: Final answer
    x = 13,211.32

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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.