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Finding the Fourth Proportional to 66,331.80, 99,351.90 and 39,990.60

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Solution

The fourth proportional to 66,331.80, 99,351.90 and 39,990.60 is: 59,898.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,331.80 : 99,351.90 = 39,990.60 : x
  2. Step 2: Convert to fraction form
    66,331.80/99,351.90 = 39,990.60/x
  3. Step 3: Cross multiply
    66,331.80x = 99,351.90 × 39,990.60
  4. Step 4: Simplify right side
    66,331.80x = 3,973,142,092.14
  5. Step 5: Solve for x
    x = 3,973,142,092.14/66,331.80
  6. Step 6: Final answer
    x = 59,898.00

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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.