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Finding the Fourth Proportional to 208,988.70, 313,504.89 and 68,758.38

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Solution

The fourth proportional to 208,988.70, 313,504.89 and 68,758.38 is: 103,144.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,988.70 : 313,504.89 = 68,758.38 : x
  2. Step 2: Convert to fraction form
    208,988.70/313,504.89 = 68,758.38/x
  3. Step 3: Cross multiply
    208,988.70x = 313,504.89 × 68,758.38
  4. Step 4: Simplify right side
    208,988.70x = 21,556,088,358.48
  5. Step 5: Solve for x
    x = 21,556,088,358.48/208,988.70
  6. Step 6: Final answer
    x = 103,144.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.