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Finding the Fourth Proportional to 118,831.86, 178,127.91 and 74,489.83

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Solution

The fourth proportional to 118,831.86, 178,127.91 and 74,489.83 is: 111,659.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,831.86 : 178,127.91 = 74,489.83 : x
  2. Step 2: Convert to fraction form
    118,831.86/178,127.91 = 74,489.83/x
  3. Step 3: Cross multiply
    118,831.86x = 178,127.91 × 74,489.83
  4. Step 4: Simplify right side
    118,831.86x = 13,268,717,288.84
  5. Step 5: Solve for x
    x = 13,268,717,288.84/118,831.86
  6. Step 6: Final answer
    x = 111,659.59

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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.