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Finding the Fourth Proportional to 28,230.80, 42,259.80 and 20,454.80

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Solution

The fourth proportional to 28,230.80, 42,259.80 and 20,454.80 is: 30,619.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,230.80 : 42,259.80 = 20,454.80 : x
  2. Step 2: Convert to fraction form
    28,230.80/42,259.80 = 20,454.80/x
  3. Step 3: Cross multiply
    28,230.80x = 42,259.80 × 20,454.80
  4. Step 4: Simplify right side
    28,230.80x = 864,415,757.04
  5. Step 5: Solve for x
    x = 864,415,757.04/28,230.80
  6. Step 6: Final answer
    x = 30,619.60

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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.