Home / 81,379.40-121,996.20-53,312.90

Finding the Fourth Proportional to 81,379.40, 121,996.20 and 53,312.90

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Solution

The fourth proportional to 81,379.40, 121,996.20 and 53,312.90 is: 79,921.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,379.40 : 121,996.20 = 53,312.90 : x
  2. Step 2: Convert to fraction form
    81,379.40/121,996.20 = 53,312.90/x
  3. Step 3: Cross multiply
    81,379.40x = 121,996.20 × 53,312.90
  4. Step 4: Simplify right side
    81,379.40x = 6,503,971,210.98
  5. Step 5: Solve for x
    x = 6,503,971,210.98/81,379.40
  6. Step 6: Final answer
    x = 79,921.59

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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.