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Finding the Fourth Proportional to 66,269.20, 99,403.80 and 17,021.20

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Solution

The fourth proportional to 66,269.20, 99,403.80 and 17,021.20 is: 25,531.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,269.20 : 99,403.80 = 17,021.20 : x
  2. Step 2: Convert to fraction form
    66,269.20/99,403.80 = 17,021.20/x
  3. Step 3: Cross multiply
    66,269.20x = 99,403.80 × 17,021.20
  4. Step 4: Simplify right side
    66,269.20x = 1,691,971,960.56
  5. Step 5: Solve for x
    x = 1,691,971,960.56/66,269.20
  6. Step 6: Final answer
    x = 25,531.80

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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.