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Finding the Fourth Proportional to 72,143.70, 108,215.55 and 19,553.19

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Solution

The fourth proportional to 72,143.70, 108,215.55 and 19,553.19 is: 29,329.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,143.70 : 108,215.55 = 19,553.19 : x
  2. Step 2: Convert to fraction form
    72,143.70/108,215.55 = 19,553.19/x
  3. Step 3: Cross multiply
    72,143.70x = 108,215.55 × 19,553.19
  4. Step 4: Simplify right side
    72,143.70x = 2,115,958,859.29
  5. Step 5: Solve for x
    x = 2,115,958,859.29/72,143.70
  6. Step 6: Final answer
    x = 29,329.78

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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.