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Finding the Fourth Proportional to 143,698.39, 215,680.62 and 72,671.31

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Solution

The fourth proportional to 143,698.39, 215,680.62 and 72,671.31 is: 109,074.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,698.39 : 215,680.62 = 72,671.31 : x
  2. Step 2: Convert to fraction form
    143,698.39/215,680.62 = 72,671.31/x
  3. Step 3: Cross multiply
    143,698.39x = 215,680.62 × 72,671.31
  4. Step 4: Simplify right side
    143,698.39x = 15,673,793,469.53
  5. Step 5: Solve for x
    x = 15,673,793,469.53/143,698.39
  6. Step 6: Final answer
    x = 109,074.25

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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.