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Finding the Fourth Proportional to 71,425.80, 107,140.32 and 18,840.60

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Solution

The fourth proportional to 71,425.80, 107,140.32 and 18,840.60 is: 28,261.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,425.80 : 107,140.32 = 18,840.60 : x
  2. Step 2: Convert to fraction form
    71,425.80/107,140.32 = 18,840.60/x
  3. Step 3: Cross multiply
    71,425.80x = 107,140.32 × 18,840.60
  4. Step 4: Simplify right side
    71,425.80x = 2,018,587,912.99
  5. Step 5: Solve for x
    x = 2,018,587,912.99/71,425.80
  6. Step 6: Final answer
    x = 28,261.33

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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.