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Finding the Fourth Proportional to 136,812.71, 188,747.26 and 91,418.79

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Solution

The fourth proportional to 136,812.71, 188,747.26 and 91,418.79 is: 126,121.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,812.71 : 188,747.26 = 91,418.79 : x
  2. Step 2: Convert to fraction form
    136,812.71/188,747.26 = 91,418.79/x
  3. Step 3: Cross multiply
    136,812.71x = 188,747.26 × 91,418.79
  4. Step 4: Simplify right side
    136,812.71x = 17,255,047,118.50
  5. Step 5: Solve for x
    x = 17,255,047,118.50/136,812.71
  6. Step 6: Final answer
    x = 126,121.67

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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.