Home / 81,180.24-121,713.12-31,218.36

Finding the Fourth Proportional to 81,180.24, 121,713.12 and 31,218.36

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Solution

The fourth proportional to 81,180.24, 121,713.12 and 31,218.36 is: 46,805.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,180.24 : 121,713.12 = 31,218.36 : x
  2. Step 2: Convert to fraction form
    81,180.24/121,713.12 = 31,218.36/x
  3. Step 3: Cross multiply
    81,180.24x = 121,713.12 × 31,218.36
  4. Step 4: Simplify right side
    81,180.24x = 3,799,683,996.88
  5. Step 5: Solve for x
    x = 3,799,683,996.88/81,180.24
  6. Step 6: Final answer
    x = 46,805.53

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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.