Home / 81,389.90-121,895.31-79,147.70

Finding the Fourth Proportional to 81,389.90, 121,895.31 and 79,147.70

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Solution

The fourth proportional to 81,389.90, 121,895.31 and 79,147.70 is: 118,537.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,389.90 : 121,895.31 = 79,147.70 : x
  2. Step 2: Convert to fraction form
    81,389.90/121,895.31 = 79,147.70/x
  3. Step 3: Cross multiply
    81,389.90x = 121,895.31 × 79,147.70
  4. Step 4: Simplify right side
    81,389.90x = 9,647,733,427.29
  5. Step 5: Solve for x
    x = 9,647,733,427.29/81,389.90
  6. Step 6: Final answer
    x = 118,537.23

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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.