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Finding the Fourth Proportional to 47,425.80, 71,138.70 and 45,238.80

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Solution

The fourth proportional to 47,425.80, 71,138.70 and 45,238.80 is: 67,858.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,425.80 : 71,138.70 = 45,238.80 : x
  2. Step 2: Convert to fraction form
    47,425.80/71,138.70 = 45,238.80/x
  3. Step 3: Cross multiply
    47,425.80x = 71,138.70 × 45,238.80
  4. Step 4: Simplify right side
    47,425.80x = 3,218,229,421.56
  5. Step 5: Solve for x
    x = 3,218,229,421.56/47,425.80
  6. Step 6: Final answer
    x = 67,858.20

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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.