Home / 81,831.78-122,784.90-39,689.10

Finding the Fourth Proportional to 81,831.78, 122,784.90 and 39,689.10

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Solution

The fourth proportional to 81,831.78, 122,784.90 and 39,689.10 is: 59,551.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,831.78 : 122,784.90 = 39,689.10 : x
  2. Step 2: Convert to fraction form
    81,831.78/122,784.90 = 39,689.10/x
  3. Step 3: Cross multiply
    81,831.78x = 122,784.90 × 39,689.10
  4. Step 4: Simplify right side
    81,831.78x = 4,873,222,174.59
  5. Step 5: Solve for x
    x = 4,873,222,174.59/81,831.78
  6. Step 6: Final answer
    x = 59,551.71

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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.