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Finding the Fourth Proportional to 218,887.60, 328,331.40 and 61,115.80

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Solution

The fourth proportional to 218,887.60, 328,331.40 and 61,115.80 is: 91,673.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,887.60 : 328,331.40 = 61,115.80 : x
  2. Step 2: Convert to fraction form
    218,887.60/328,331.40 = 61,115.80/x
  3. Step 3: Cross multiply
    218,887.60x = 328,331.40 × 61,115.80
  4. Step 4: Simplify right side
    218,887.60x = 20,066,236,176.12
  5. Step 5: Solve for x
    x = 20,066,236,176.12/218,887.60
  6. Step 6: Final answer
    x = 91,673.70

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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.