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Finding the Fourth Proportional to 143,999.80, 215,999.70 and 138,167.80

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Solution

The fourth proportional to 143,999.80, 215,999.70 and 138,167.80 is: 207,251.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,999.80 : 215,999.70 = 138,167.80 : x
  2. Step 2: Convert to fraction form
    143,999.80/215,999.70 = 138,167.80/x
  3. Step 3: Cross multiply
    143,999.80x = 215,999.70 × 138,167.80
  4. Step 4: Simplify right side
    143,999.80x = 29,844,203,349.66
  5. Step 5: Solve for x
    x = 29,844,203,349.66/143,999.80
  6. Step 6: Final answer
    x = 207,251.70

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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.