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Finding the Fourth Proportional to 73,729.80, 110,475.90 and 66,731.40

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Solution

The fourth proportional to 73,729.80, 110,475.90 and 66,731.40 is: 99,989.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,729.80 : 110,475.90 = 66,731.40 : x
  2. Step 2: Convert to fraction form
    73,729.80/110,475.90 = 66,731.40/x
  3. Step 3: Cross multiply
    73,729.80x = 110,475.90 × 66,731.40
  4. Step 4: Simplify right side
    73,729.80x = 7,372,211,473.26
  5. Step 5: Solve for x
    x = 7,372,211,473.26/73,729.80
  6. Step 6: Final answer
    x = 99,989.58

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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.