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Finding the Fourth Proportional to 138,743.70, 208,115.55 and 103,751.70

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Solution

The fourth proportional to 138,743.70, 208,115.55 and 103,751.70 is: 155,627.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,743.70 : 208,115.55 = 103,751.70 : x
  2. Step 2: Convert to fraction form
    138,743.70/208,115.55 = 103,751.70/x
  3. Step 3: Cross multiply
    138,743.70x = 208,115.55 × 103,751.70
  4. Step 4: Simplify right side
    138,743.70x = 21,592,342,108.94
  5. Step 5: Solve for x
    x = 21,592,342,108.94/138,743.70
  6. Step 6: Final answer
    x = 155,627.55

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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.