Home / 81,013.80-121,520.70-71,172.30

Finding the Fourth Proportional to 81,013.80, 121,520.70 and 71,172.30

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Solution

The fourth proportional to 81,013.80, 121,520.70 and 71,172.30 is: 106,758.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,013.80 : 121,520.70 = 71,172.30 : x
  2. Step 2: Convert to fraction form
    81,013.80/121,520.70 = 71,172.30/x
  3. Step 3: Cross multiply
    81,013.80x = 121,520.70 × 71,172.30
  4. Step 4: Simplify right side
    81,013.80x = 8,648,907,716.61
  5. Step 5: Solve for x
    x = 8,648,907,716.61/81,013.80
  6. Step 6: Final answer
    x = 106,758.45

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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.