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Finding the Fourth Proportional to 143,906.70, 215,860.05 and 91,418.70

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Solution

The fourth proportional to 143,906.70, 215,860.05 and 91,418.70 is: 137,128.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,906.70 : 215,860.05 = 91,418.70 : x
  2. Step 2: Convert to fraction form
    143,906.70/215,860.05 = 91,418.70/x
  3. Step 3: Cross multiply
    143,906.70x = 215,860.05 × 91,418.70
  4. Step 4: Simplify right side
    143,906.70x = 19,733,645,152.94
  5. Step 5: Solve for x
    x = 19,733,645,152.94/143,906.70
  6. Step 6: Final answer
    x = 137,128.05

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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.