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Finding the Fourth Proportional to 138,890.70, 191,668.23 and 78,480.90

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Solution

The fourth proportional to 138,890.70, 191,668.23 and 78,480.90 is: 108,303.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,890.70 : 191,668.23 = 78,480.90 : x
  2. Step 2: Convert to fraction form
    138,890.70/191,668.23 = 78,480.90/x
  3. Step 3: Cross multiply
    138,890.70x = 191,668.23 × 78,480.90
  4. Step 4: Simplify right side
    138,890.70x = 15,042,295,191.81
  5. Step 5: Solve for x
    x = 15,042,295,191.81/138,890.70
  6. Step 6: Final answer
    x = 108,303.11

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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.