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Finding the Fourth Proportional to 158,318.82, 218,469.96 and 86,699.70

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Solution

The fourth proportional to 158,318.82, 218,469.96 and 86,699.70 is: 119,640.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,318.82 : 218,469.96 = 86,699.70 : x
  2. Step 2: Convert to fraction form
    158,318.82/218,469.96 = 86,699.70/x
  3. Step 3: Cross multiply
    158,318.82x = 218,469.96 × 86,699.70
  4. Step 4: Simplify right side
    158,318.82x = 18,941,279,991.01
  5. Step 5: Solve for x
    x = 18,941,279,991.01/158,318.82
  6. Step 6: Final answer
    x = 119,640.10

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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.