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Finding the Fourth Proportional to 20,486.71, 30,715.48 and 12,146.95

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Solution

The fourth proportional to 20,486.71, 30,715.48 and 12,146.95 is: 18,211.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.71 : 30,715.48 = 12,146.95 : x
  2. Step 2: Convert to fraction form
    20,486.71/30,715.48 = 12,146.95/x
  3. Step 3: Cross multiply
    20,486.71x = 30,715.48 × 12,146.95
  4. Step 4: Simplify right side
    20,486.71x = 373,099,399.79
  5. Step 5: Solve for x
    x = 373,099,399.79/20,486.71
  6. Step 6: Final answer
    x = 18,211.78

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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.