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Finding the Fourth Proportional to 70,170.12, 105,258.42 and 38,981.88

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Solution

The fourth proportional to 70,170.12, 105,258.42 and 38,981.88 is: 58,474.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,170.12 : 105,258.42 = 38,981.88 : x
  2. Step 2: Convert to fraction form
    70,170.12/105,258.42 = 38,981.88/x
  3. Step 3: Cross multiply
    70,170.12x = 105,258.42 × 38,981.88
  4. Step 4: Simplify right side
    70,170.12x = 4,103,171,097.43
  5. Step 5: Solve for x
    x = 4,103,171,097.43/70,170.12
  6. Step 6: Final answer
    x = 58,474.62

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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.