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Finding the Fourth Proportional to 121,831.32, 168,121.50 and 68,123.16

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Solution

The fourth proportional to 121,831.32, 168,121.50 and 68,123.16 is: 94,006.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,831.32 : 168,121.50 = 68,123.16 : x
  2. Step 2: Convert to fraction form
    121,831.32/168,121.50 = 68,123.16/x
  3. Step 3: Cross multiply
    121,831.32x = 168,121.50 × 68,123.16
  4. Step 4: Simplify right side
    121,831.32x = 11,452,967,843.94
  5. Step 5: Solve for x
    x = 11,452,967,843.94/121,831.32
  6. Step 6: Final answer
    x = 94,006.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.