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Finding the Fourth Proportional to 218,999.57, 328,073.28 and 143,891.51

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Solution

The fourth proportional to 218,999.57, 328,073.28 and 143,891.51 is: 215,557.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,999.57 : 328,073.28 = 143,891.51 : x
  2. Step 2: Convert to fraction form
    218,999.57/328,073.28 = 143,891.51/x
  3. Step 3: Cross multiply
    218,999.57x = 328,073.28 × 143,891.51
  4. Step 4: Simplify right side
    218,999.57x = 47,206,958,009.49
  5. Step 5: Solve for x
    x = 47,206,958,009.49/218,999.57
  6. Step 6: Final answer
    x = 215,557.31

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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.