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Finding the Fourth Proportional to 80,979.40, 121,469.10 and 70,611.40

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Solution

The fourth proportional to 80,979.40, 121,469.10 and 70,611.40 is: 105,917.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,979.40 : 121,469.10 = 70,611.40 : x
  2. Step 2: Convert to fraction form
    80,979.40/121,469.10 = 70,611.40/x
  3. Step 3: Cross multiply
    80,979.40x = 121,469.10 × 70,611.40
  4. Step 4: Simplify right side
    80,979.40x = 8,577,103,207.74
  5. Step 5: Solve for x
    x = 8,577,103,207.74/80,979.40
  6. Step 6: Final answer
    x = 105,917.10

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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.