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Finding the Fourth Proportional to 43,398.20, 65,121.89 and 17,121.40

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Solution

The fourth proportional to 43,398.20, 65,121.89 and 17,121.40 is: 25,691.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,398.20 : 65,121.89 = 17,121.40 : x
  2. Step 2: Convert to fraction form
    43,398.20/65,121.89 = 17,121.40/x
  3. Step 3: Cross multiply
    43,398.20x = 65,121.89 × 17,121.40
  4. Step 4: Simplify right side
    43,398.20x = 1,114,977,927.45
  5. Step 5: Solve for x
    x = 1,114,977,927.45/43,398.20
  6. Step 6: Final answer
    x = 25,691.80

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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.