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Finding the Fourth Proportional to 20,140.80, 30,211.20 and 13,142.40

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Solution

The fourth proportional to 20,140.80, 30,211.20 and 13,142.40 is: 19,713.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,140.80 : 30,211.20 = 13,142.40 : x
  2. Step 2: Convert to fraction form
    20,140.80/30,211.20 = 13,142.40/x
  3. Step 3: Cross multiply
    20,140.80x = 30,211.20 × 13,142.40
  4. Step 4: Simplify right side
    20,140.80x = 397,047,674.88
  5. Step 5: Solve for x
    x = 397,047,674.88/20,140.80
  6. Step 6: Final answer
    x = 19,713.60

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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.