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Finding the Fourth Proportional to 70,154.40, 105,231.60 and 20,906.40

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Solution

The fourth proportional to 70,154.40, 105,231.60 and 20,906.40 is: 31,359.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,154.40 : 105,231.60 = 20,906.40 : x
  2. Step 2: Convert to fraction form
    70,154.40/105,231.60 = 20,906.40/x
  3. Step 3: Cross multiply
    70,154.40x = 105,231.60 × 20,906.40
  4. Step 4: Simplify right side
    70,154.40x = 2,200,013,922.24
  5. Step 5: Solve for x
    x = 2,200,013,922.24/70,154.40
  6. Step 6: Final answer
    x = 31,359.60

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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.