Home / 81,209.45-121,814.18-39,620.81

Finding the Fourth Proportional to 81,209.45, 121,814.18 and 39,620.81

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Solution

The fourth proportional to 81,209.45, 121,814.18 and 39,620.81 is: 59,431.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,209.45 : 121,814.18 = 39,620.81 : x
  2. Step 2: Convert to fraction form
    81,209.45/121,814.18 = 39,620.81/x
  3. Step 3: Cross multiply
    81,209.45x = 121,814.18 × 39,620.81
  4. Step 4: Simplify right side
    81,209.45x = 4,826,376,736.10
  5. Step 5: Solve for x
    x = 4,826,376,736.10/81,209.45
  6. Step 6: Final answer
    x = 59,431.22

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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.