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Finding the Fourth Proportional to 30,191.20, 45,268.80 and 18,512.80

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Solution

The fourth proportional to 30,191.20, 45,268.80 and 18,512.80 is: 27,758.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,191.20 : 45,268.80 = 18,512.80 : x
  2. Step 2: Convert to fraction form
    30,191.20/45,268.80 = 18,512.80/x
  3. Step 3: Cross multiply
    30,191.20x = 45,268.80 × 18,512.80
  4. Step 4: Simplify right side
    30,191.20x = 838,052,240.64
  5. Step 5: Solve for x
    x = 838,052,240.64/30,191.20
  6. Step 6: Final answer
    x = 27,758.16

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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.