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Finding the Fourth Proportional to 66,197.88, 91,355.09 and 40,719.20

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Solution

The fourth proportional to 66,197.88, 91,355.09 and 40,719.20 is: 56,193.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,197.88 : 91,355.09 = 40,719.20 : x
  2. Step 2: Convert to fraction form
    66,197.88/91,355.09 = 40,719.20/x
  3. Step 3: Cross multiply
    66,197.88x = 91,355.09 × 40,719.20
  4. Step 4: Simplify right side
    66,197.88x = 3,719,905,520.36
  5. Step 5: Solve for x
    x = 3,719,905,520.36/66,197.88
  6. Step 6: Final answer
    x = 56,193.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.