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Finding the Fourth Proportional to 98,425.51, 135,831.62 and 55,419.80

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Solution

The fourth proportional to 98,425.51, 135,831.62 and 55,419.80 is: 76,481.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,425.51 : 135,831.62 = 55,419.80 : x
  2. Step 2: Convert to fraction form
    98,425.51/135,831.62 = 55,419.80/x
  3. Step 3: Cross multiply
    98,425.51x = 135,831.62 × 55,419.80
  4. Step 4: Simplify right side
    98,425.51x = 7,527,760,673.47
  5. Step 5: Solve for x
    x = 7,527,760,673.47/98,425.51
  6. Step 6: Final answer
    x = 76,481.81

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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.