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Finding the Fourth Proportional to 65,872.80, 98,679.60 and 39,499.20

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Solution

The fourth proportional to 65,872.80, 98,679.60 and 39,499.20 is: 59,171.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,872.80 : 98,679.60 = 39,499.20 : x
  2. Step 2: Convert to fraction form
    65,872.80/98,679.60 = 39,499.20/x
  3. Step 3: Cross multiply
    65,872.80x = 98,679.60 × 39,499.20
  4. Step 4: Simplify right side
    65,872.80x = 3,897,765,256.32
  5. Step 5: Solve for x
    x = 3,897,765,256.32/65,872.80
  6. Step 6: Final answer
    x = 59,171.09

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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.