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Finding the Fourth Proportional to 20,607.40, 30,919.20 and 8,125.30

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Solution

The fourth proportional to 20,607.40, 30,919.20 and 8,125.30 is: 12,191.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,607.40 : 30,919.20 = 8,125.30 : x
  2. Step 2: Convert to fraction form
    20,607.40/30,919.20 = 8,125.30/x
  3. Step 3: Cross multiply
    20,607.40x = 30,919.20 × 8,125.30
  4. Step 4: Simplify right side
    20,607.40x = 251,227,775.76
  5. Step 5: Solve for x
    x = 251,227,775.76/20,607.40
  6. Step 6: Final answer
    x = 12,191.14

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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.