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Finding the Fourth Proportional to 158,619.20, 218,894.81 and 86,999.81

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Solution

The fourth proportional to 158,619.20, 218,894.81 and 86,999.81 is: 120,059.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,619.20 : 218,894.81 = 86,999.81 : x
  2. Step 2: Convert to fraction form
    158,619.20/218,894.81 = 86,999.81/x
  3. Step 3: Cross multiply
    158,619.20x = 218,894.81 × 86,999.81
  4. Step 4: Simplify right side
    158,619.20x = 19,043,805,350.51
  5. Step 5: Solve for x
    x = 19,043,805,350.51/158,619.20
  6. Step 6: Final answer
    x = 120,059.90

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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.