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Finding the Fourth Proportional to 128,336.67, 177,100.16 and 71,747.91

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Solution

The fourth proportional to 128,336.67, 177,100.16 and 71,747.91 is: 99,009.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,336.67 : 177,100.16 = 71,747.91 : x
  2. Step 2: Convert to fraction form
    128,336.67/177,100.16 = 71,747.91/x
  3. Step 3: Cross multiply
    128,336.67x = 177,100.16 × 71,747.91
  4. Step 4: Simplify right side
    128,336.67x = 12,706,565,981.93
  5. Step 5: Solve for x
    x = 12,706,565,981.93/128,336.67
  6. Step 6: Final answer
    x = 99,009.63

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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.