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Finding the Fourth Proportional to 71,918.67, 107,860.68 and 21,999.20

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Solution

The fourth proportional to 71,918.67, 107,860.68 and 21,999.20 is: 32,993.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,918.67 : 107,860.68 = 21,999.20 : x
  2. Step 2: Convert to fraction form
    71,918.67/107,860.68 = 21,999.20/x
  3. Step 3: Cross multiply
    71,918.67x = 107,860.68 × 21,999.20
  4. Step 4: Simplify right side
    71,918.67x = 2,372,848,132.15
  5. Step 5: Solve for x
    x = 2,372,848,132.15/71,918.67
  6. Step 6: Final answer
    x = 32,993.49

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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.