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Finding the Fourth Proportional to 20,489.15, 30,728.10 and 12,981.44

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Solution

The fourth proportional to 20,489.15, 30,728.10 and 12,981.44 is: 19,468.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.15 : 30,728.10 = 12,981.44 : x
  2. Step 2: Convert to fraction form
    20,489.15/30,728.10 = 12,981.44/x
  3. Step 3: Cross multiply
    20,489.15x = 30,728.10 × 12,981.44
  4. Step 4: Simplify right side
    20,489.15x = 398,894,986.46
  5. Step 5: Solve for x
    x = 398,894,986.46/20,489.15
  6. Step 6: Final answer
    x = 19,468.60

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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.