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Finding the Fourth Proportional to 143,906.20, 215,859.30 and 91,547.80

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Solution

The fourth proportional to 143,906.20, 215,859.30 and 91,547.80 is: 137,321.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,906.20 : 215,859.30 = 91,547.80 : x
  2. Step 2: Convert to fraction form
    143,906.20/215,859.30 = 91,547.80/x
  3. Step 3: Cross multiply
    143,906.20x = 215,859.30 × 91,547.80
  4. Step 4: Simplify right side
    143,906.20x = 19,761,444,024.54
  5. Step 5: Solve for x
    x = 19,761,444,024.54/143,906.20
  6. Step 6: Final answer
    x = 137,321.70

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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.