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Finding the Fourth Proportional to 218,612.39, 327,918.59 and 85,399.23

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Solution

The fourth proportional to 218,612.39, 327,918.59 and 85,399.23 is: 128,098.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,612.39 : 327,918.59 = 85,399.23 : x
  2. Step 2: Convert to fraction form
    218,612.39/327,918.59 = 85,399.23/x
  3. Step 3: Cross multiply
    218,612.39x = 327,918.59 × 85,399.23
  4. Step 4: Simplify right side
    218,612.39x = 28,003,994,661.69
  5. Step 5: Solve for x
    x = 28,003,994,661.69/218,612.39
  6. Step 6: Final answer
    x = 128,098.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.