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Finding the Fourth Proportional to 208,858.60, 313,287.90 and 137,999.80

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Solution

The fourth proportional to 208,858.60, 313,287.90 and 137,999.80 is: 206,999.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,858.60 : 313,287.90 = 137,999.80 : x
  2. Step 2: Convert to fraction form
    208,858.60/313,287.90 = 137,999.80/x
  3. Step 3: Cross multiply
    208,858.60x = 313,287.90 × 137,999.80
  4. Step 4: Simplify right side
    208,858.60x = 43,233,667,542.42
  5. Step 5: Solve for x
    x = 43,233,667,542.42/208,858.60
  6. Step 6: Final answer
    x = 206,999.70

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1.5x scale

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.