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Finding the Fourth Proportional to 20,157.40, 30,245.10 and 7,019.20

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Solution

The fourth proportional to 20,157.40, 30,245.10 and 7,019.20 is: 10,531.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,157.40 : 30,245.10 = 7,019.20 : x
  2. Step 2: Convert to fraction form
    20,157.40/30,245.10 = 7,019.20/x
  3. Step 3: Cross multiply
    20,157.40x = 30,245.10 × 7,019.20
  4. Step 4: Simplify right side
    20,157.40x = 212,296,405.92
  5. Step 5: Solve for x
    x = 212,296,405.92/20,157.40
  6. Step 6: Final answer
    x = 10,531.93

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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.