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Finding the Fourth Proportional to 70,398.40, 105,614.18 and 20,479.60

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Solution

The fourth proportional to 70,398.40, 105,614.18 and 20,479.60 is: 30,724.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,398.40 : 105,614.18 = 20,479.60 : x
  2. Step 2: Convert to fraction form
    70,398.40/105,614.18 = 20,479.60/x
  3. Step 3: Cross multiply
    70,398.40x = 105,614.18 × 20,479.60
  4. Step 4: Simplify right side
    70,398.40x = 2,162,936,160.73
  5. Step 5: Solve for x
    x = 2,162,936,160.73/70,398.40
  6. Step 6: Final answer
    x = 30,724.22

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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.