Home / 81,275.31-121,921.17-30,661.64

Finding the Fourth Proportional to 81,275.31, 121,921.17 and 30,661.64

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Solution

The fourth proportional to 81,275.31, 121,921.17 and 30,661.64 is: 45,995.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,275.31 : 121,921.17 = 30,661.64 : x
  2. Step 2: Convert to fraction form
    81,275.31/121,921.17 = 30,661.64/x
  3. Step 3: Cross multiply
    81,275.31x = 121,921.17 × 30,661.64
  4. Step 4: Simplify right side
    81,275.31x = 3,738,302,820.21
  5. Step 5: Solve for x
    x = 3,738,302,820.21/81,275.31
  6. Step 6: Final answer
    x = 45,995.55

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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.