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Finding the Fourth Proportional to 80,465.40, 120,719.70 and 71,760.60

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Solution

The fourth proportional to 80,465.40, 120,719.70 and 71,760.60 is: 107,660.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,465.40 : 120,719.70 = 71,760.60 : x
  2. Step 2: Convert to fraction form
    80,465.40/120,719.70 = 71,760.60/x
  3. Step 3: Cross multiply
    80,465.40x = 120,719.70 × 71,760.60
  4. Step 4: Simplify right side
    80,465.40x = 8,662,918,103.82
  5. Step 5: Solve for x
    x = 8,662,918,103.82/80,465.40
  6. Step 6: Final answer
    x = 107,660.16

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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.