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Finding the Fourth Proportional to 20,468.60, 30,719.10 and 7,994.60

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Solution

The fourth proportional to 20,468.60, 30,719.10 and 7,994.60 is: 11,998.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,468.60 : 30,719.10 = 7,994.60 : x
  2. Step 2: Convert to fraction form
    20,468.60/30,719.10 = 7,994.60/x
  3. Step 3: Cross multiply
    20,468.60x = 30,719.10 × 7,994.60
  4. Step 4: Simplify right side
    20,468.60x = 245,586,916.86
  5. Step 5: Solve for x
    x = 245,586,916.86/20,468.60
  6. Step 6: Final answer
    x = 11,998.23

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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.