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Finding the Fourth Proportional to 39,906.40, 59,859.60 and 18,846.40

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Solution

The fourth proportional to 39,906.40, 59,859.60 and 18,846.40 is: 28,269.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,906.40 : 59,859.60 = 18,846.40 : x
  2. Step 2: Convert to fraction form
    39,906.40/59,859.60 = 18,846.40/x
  3. Step 3: Cross multiply
    39,906.40x = 59,859.60 × 18,846.40
  4. Step 4: Simplify right side
    39,906.40x = 1,128,137,965.44
  5. Step 5: Solve for x
    x = 1,128,137,965.44/39,906.40
  6. Step 6: Final answer
    x = 28,269.60

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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.