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Finding the Fourth Proportional to 39,992, 59,989.08 and 12,290

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Solution

The fourth proportional to 39,992, 59,989.08 and 12,290 is: 18,435.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,992 : 59,989.08 = 12,290 : x
  2. Step 2: Convert to fraction form
    39,992/59,989.08 = 12,290/x
  3. Step 3: Cross multiply
    39,992x = 59,989.08 × 12,290
  4. Step 4: Simplify right side
    39,992x = 737,265,793.20
  5. Step 5: Solve for x
    x = 737,265,793.20/39,992
  6. Step 6: Final answer
    x = 18,435.33

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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.