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Finding the Fourth Proportional to 87,656.64, 120,967.20 and 47,912.64

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Solution

The fourth proportional to 87,656.64, 120,967.20 and 47,912.64 is: 66,120.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,656.64 : 120,967.20 = 47,912.64 : x
  2. Step 2: Convert to fraction form
    87,656.64/120,967.20 = 47,912.64/x
  3. Step 3: Cross multiply
    87,656.64x = 120,967.20 × 47,912.64
  4. Step 4: Simplify right side
    87,656.64x = 5,795,857,905.41
  5. Step 5: Solve for x
    x = 5,795,857,905.41/87,656.64
  6. Step 6: Final answer
    x = 66,120.01

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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.