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Finding the Fourth Proportional to 66,540.80, 99,811.20 and 42,921.20

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Solution

The fourth proportional to 66,540.80, 99,811.20 and 42,921.20 is: 64,381.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,540.80 : 99,811.20 = 42,921.20 : x
  2. Step 2: Convert to fraction form
    66,540.80/99,811.20 = 42,921.20/x
  3. Step 3: Cross multiply
    66,540.80x = 99,811.20 × 42,921.20
  4. Step 4: Simplify right side
    66,540.80x = 4,284,016,477.44
  5. Step 5: Solve for x
    x = 4,284,016,477.44/66,540.80
  6. Step 6: Final answer
    x = 64,381.80

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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.