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Finding the Fourth Proportional to 66,559.50, 99,842.49 and 19,812.78

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Solution

The fourth proportional to 66,559.50, 99,842.49 and 19,812.78 is: 29,720.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,559.50 : 99,842.49 = 19,812.78 : x
  2. Step 2: Convert to fraction form
    66,559.50/99,842.49 = 19,812.78/x
  3. Step 3: Cross multiply
    66,559.50x = 99,842.49 × 19,812.78
  4. Step 4: Simplify right side
    66,559.50x = 1,978,157,289.02
  5. Step 5: Solve for x
    x = 1,978,157,289.02/66,559.50
  6. Step 6: Final answer
    x = 29,720.13

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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.