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Finding the Fourth Proportional to 158,618.82, 218,894.28 and 86,999.43

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Solution

The fourth proportional to 158,618.82, 218,894.28 and 86,999.43 is: 120,059.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,618.82 : 218,894.28 = 86,999.43 : x
  2. Step 2: Convert to fraction form
    158,618.82/218,894.28 = 86,999.43/x
  3. Step 3: Cross multiply
    158,618.82x = 218,894.28 × 86,999.43
  4. Step 4: Simplify right side
    158,618.82x = 19,043,677,590.26
  5. Step 5: Solve for x
    x = 19,043,677,590.26/158,618.82
  6. Step 6: Final answer
    x = 120,059.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.