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Finding the Fourth Proportional to 39,993.78, 59,990.70 and 12,291.78

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Solution

The fourth proportional to 39,993.78, 59,990.70 and 12,291.78 is: 18,437.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,993.78 : 59,990.70 = 12,291.78 : x
  2. Step 2: Convert to fraction form
    39,993.78/59,990.70 = 12,291.78/x
  3. Step 3: Cross multiply
    39,993.78x = 59,990.70 × 12,291.78
  4. Step 4: Simplify right side
    39,993.78x = 737,392,486.45
  5. Step 5: Solve for x
    x = 737,392,486.45/39,993.78
  6. Step 6: Final answer
    x = 18,437.68

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1.5x scale

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.