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Finding the Fourth Proportional to 126,138, 174,071.79 and 68,776.86

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Solution

The fourth proportional to 126,138, 174,071.79 and 68,776.86 is: 94,912.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,138 : 174,071.79 = 68,776.86 : x
  2. Step 2: Convert to fraction form
    126,138/174,071.79 = 68,776.86/x
  3. Step 3: Cross multiply
    126,138x = 174,071.79 × 68,776.86
  4. Step 4: Simplify right side
    126,138x = 11,972,111,130.78
  5. Step 5: Solve for x
    x = 11,972,111,130.78/126,138
  6. Step 6: Final answer
    x = 94,912.80

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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.