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Finding the Fourth Proportional to 39,866.40, 59,785.20 and 20,138.40

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Solution

The fourth proportional to 39,866.40, 59,785.20 and 20,138.40 is: 30,200.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,866.40 : 59,785.20 = 20,138.40 : x
  2. Step 2: Convert to fraction form
    39,866.40/59,785.20 = 20,138.40/x
  3. Step 3: Cross multiply
    39,866.40x = 59,785.20 × 20,138.40
  4. Step 4: Simplify right side
    39,866.40x = 1,203,978,271.68
  5. Step 5: Solve for x
    x = 1,203,978,271.68/39,866.40
  6. Step 6: Final answer
    x = 30,200.33

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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.