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Finding the Fourth Proportional to 20,188.80, 30,271.20 and 12,403.20

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Solution

The fourth proportional to 20,188.80, 30,271.20 and 12,403.20 is: 18,597.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,188.80 : 30,271.20 = 12,403.20 : x
  2. Step 2: Convert to fraction form
    20,188.80/30,271.20 = 12,403.20/x
  3. Step 3: Cross multiply
    20,188.80x = 30,271.20 × 12,403.20
  4. Step 4: Simplify right side
    20,188.80x = 375,459,747.84
  5. Step 5: Solve for x
    x = 375,459,747.84/20,188.80
  6. Step 6: Final answer
    x = 18,597.43

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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.