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Finding the Fourth Proportional to 20,396.54, 30,591.15 and 12,978.96

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Solution

The fourth proportional to 20,396.54, 30,591.15 and 12,978.96 is: 19,466.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,396.54 : 30,591.15 = 12,978.96 : x
  2. Step 2: Convert to fraction form
    20,396.54/30,591.15 = 12,978.96/x
  3. Step 3: Cross multiply
    20,396.54x = 30,591.15 × 12,978.96
  4. Step 4: Simplify right side
    20,396.54x = 397,041,312.20
  5. Step 5: Solve for x
    x = 397,041,312.20/20,396.54
  6. Step 6: Final answer
    x = 19,466.12

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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.