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Finding the Fourth Proportional to 158,431.67, 218,640.78 and 86,816.24

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Solution

The fourth proportional to 158,431.67, 218,640.78 and 86,816.24 is: 119,809.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,431.67 : 218,640.78 = 86,816.24 : x
  2. Step 2: Convert to fraction form
    158,431.67/218,640.78 = 86,816.24/x
  3. Step 3: Cross multiply
    158,431.67x = 218,640.78 × 86,816.24
  4. Step 4: Simplify right side
    158,431.67x = 18,981,569,337.06
  5. Step 5: Solve for x
    x = 18,981,569,337.06/158,431.67
  6. Step 6: Final answer
    x = 119,809.19

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1.5x scale

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.