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Finding the Fourth Proportional to 39,906.40, 59,859.60 and 13,640.80

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Solution

The fourth proportional to 39,906.40, 59,859.60 and 13,640.80 is: 20,461.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,906.40 : 59,859.60 = 13,640.80 : x
  2. Step 2: Convert to fraction form
    39,906.40/59,859.60 = 13,640.80/x
  3. Step 3: Cross multiply
    39,906.40x = 59,859.60 × 13,640.80
  4. Step 4: Simplify right side
    39,906.40x = 816,532,831.68
  5. Step 5: Solve for x
    x = 816,532,831.68/39,906.40
  6. Step 6: Final answer
    x = 20,461.20

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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.