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Finding the Fourth Proportional to 80,994.60, 121,491.90 and 69,719.40

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Solution

The fourth proportional to 80,994.60, 121,491.90 and 69,719.40 is: 104,579.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,994.60 : 121,491.90 = 69,719.40 : x
  2. Step 2: Convert to fraction form
    80,994.60/121,491.90 = 69,719.40/x
  3. Step 3: Cross multiply
    80,994.60x = 121,491.90 × 69,719.40
  4. Step 4: Simplify right side
    80,994.60x = 8,470,342,372.86
  5. Step 5: Solve for x
    x = 8,470,342,372.86/80,994.60
  6. Step 6: Final answer
    x = 104,579.10

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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.