Home / 81,401.40-121,912.56-79,159.20

Finding the Fourth Proportional to 81,401.40, 121,912.56 and 79,159.20

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Solution

The fourth proportional to 81,401.40, 121,912.56 and 79,159.20 is: 118,554.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,401.40 : 121,912.56 = 79,159.20 : x
  2. Step 2: Convert to fraction form
    81,401.40/121,912.56 = 79,159.20/x
  3. Step 3: Cross multiply
    81,401.40x = 121,912.56 × 79,159.20
  4. Step 4: Simplify right side
    81,401.40x = 9,650,500,719.55
  5. Step 5: Solve for x
    x = 9,650,500,719.55/81,401.40
  6. Step 6: Final answer
    x = 118,554.48

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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.