Home / 81,384.40-121,979.40-41,921.20

Finding the Fourth Proportional to 81,384.40, 121,979.40 and 41,921.20

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Solution

The fourth proportional to 81,384.40, 121,979.40 and 41,921.20 is: 62,831.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,384.40 : 121,979.40 = 41,921.20 : x
  2. Step 2: Convert to fraction form
    81,384.40/121,979.40 = 41,921.20/x
  3. Step 3: Cross multiply
    81,384.40x = 121,979.40 × 41,921.20
  4. Step 4: Simplify right side
    81,384.40x = 5,113,522,823.28
  5. Step 5: Solve for x
    x = 5,113,522,823.28/81,384.40
  6. Step 6: Final answer
    x = 62,831.73

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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.