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Finding the Fourth Proportional to 158,557.50, 218,789.30 and 86,918.67

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Solution

The fourth proportional to 158,557.50, 218,789.30 and 86,918.67 is: 119,936.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,557.50 : 218,789.30 = 86,918.67 : x
  2. Step 2: Convert to fraction form
    158,557.50/218,789.30 = 86,918.67/x
  3. Step 3: Cross multiply
    158,557.50x = 218,789.30 × 86,918.67
  4. Step 4: Simplify right side
    158,557.50x = 19,016,875,183.53
  5. Step 5: Solve for x
    x = 19,016,875,183.53/158,557.50
  6. Step 6: Final answer
    x = 119,936.77

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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.