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Finding the Fourth Proportional to 39,840.49, 59,770.50 and 12,138.49

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Solution

The fourth proportional to 39,840.49, 59,770.50 and 12,138.49 is: 18,210.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,840.49 : 59,770.50 = 12,138.49 : x
  2. Step 2: Convert to fraction form
    39,840.49/59,770.50 = 12,138.49/x
  3. Step 3: Cross multiply
    39,840.49x = 59,770.50 × 12,138.49
  4. Step 4: Simplify right side
    39,840.49x = 725,523,616.55
  5. Step 5: Solve for x
    x = 725,523,616.55/39,840.49
  6. Step 6: Final answer
    x = 18,210.71

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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.