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Finding the Fourth Proportional to 128,751.92, 177,679.77 and 71,393.66

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Solution

The fourth proportional to 128,751.92, 177,679.77 and 71,393.66 is: 98,524.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,751.92 : 177,679.77 = 71,393.66 : x
  2. Step 2: Convert to fraction form
    128,751.92/177,679.77 = 71,393.66/x
  3. Step 3: Cross multiply
    128,751.92x = 177,679.77 × 71,393.66
  4. Step 4: Simplify right side
    128,751.92x = 12,685,208,199.86
  5. Step 5: Solve for x
    x = 12,685,208,199.86/128,751.92
  6. Step 6: Final answer
    x = 98,524.42

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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.