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Finding the Fourth Proportional to 218,486.69, 327,768.47 and 90,402.60

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Solution

The fourth proportional to 218,486.69, 327,768.47 and 90,402.60 is: 135,619.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,486.69 : 327,768.47 = 90,402.60 : x
  2. Step 2: Convert to fraction form
    218,486.69/327,768.47 = 90,402.60/x
  3. Step 3: Cross multiply
    218,486.69x = 327,768.47 × 90,402.60
  4. Step 4: Simplify right side
    218,486.69x = 29,631,121,434.01
  5. Step 5: Solve for x
    x = 29,631,121,434.01/218,486.69
  6. Step 6: Final answer
    x = 135,619.80

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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.