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Finding the Fourth Proportional to 42,339.60, 63,480.60 and 20,163.60

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Solution

The fourth proportional to 42,339.60, 63,480.60 and 20,163.60 is: 30,231.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,339.60 : 63,480.60 = 20,163.60 : x
  2. Step 2: Convert to fraction form
    42,339.60/63,480.60 = 20,163.60/x
  3. Step 3: Cross multiply
    42,339.60x = 63,480.60 × 20,163.60
  4. Step 4: Simplify right side
    42,339.60x = 1,279,997,426.16
  5. Step 5: Solve for x
    x = 1,279,997,426.16/42,339.60
  6. Step 6: Final answer
    x = 30,231.68

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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.