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Finding the Fourth Proportional to 143,906.90, 215,860.35 and 91,159.70

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Solution

The fourth proportional to 143,906.90, 215,860.35 and 91,159.70 is: 136,739.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,906.90 : 215,860.35 = 91,159.70 : x
  2. Step 2: Convert to fraction form
    143,906.90/215,860.35 = 91,159.70/x
  3. Step 3: Cross multiply
    143,906.90x = 215,860.35 × 91,159.70
  4. Step 4: Simplify right side
    143,906.90x = 19,677,764,747.90
  5. Step 5: Solve for x
    x = 19,677,764,747.90/143,906.90
  6. Step 6: Final answer
    x = 136,739.55

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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.