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Finding the Fourth Proportional to 20,610.84, 30,895.38 and 8,139.65

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Solution

The fourth proportional to 20,610.84, 30,895.38 and 8,139.65 is: 12,201.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,610.84 : 30,895.38 = 8,139.65 : x
  2. Step 2: Convert to fraction form
    20,610.84/30,895.38 = 8,139.65/x
  3. Step 3: Cross multiply
    20,610.84x = 30,895.38 × 8,139.65
  4. Step 4: Simplify right side
    20,610.84x = 251,477,677.40
  5. Step 5: Solve for x
    x = 251,477,677.40/20,610.84
  6. Step 6: Final answer
    x = 12,201.24

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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.