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Finding the Fourth Proportional to 70,234.21, 105,343.21 and 17,639.70

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Solution

The fourth proportional to 70,234.21, 105,343.21 and 17,639.70 is: 26,457.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,234.21 : 105,343.21 = 17,639.70 : x
  2. Step 2: Convert to fraction form
    70,234.21/105,343.21 = 17,639.70/x
  3. Step 3: Cross multiply
    70,234.21x = 105,343.21 × 17,639.70
  4. Step 4: Simplify right side
    70,234.21x = 1,858,222,621.44
  5. Step 5: Solve for x
    x = 1,858,222,621.44/70,234.21
  6. Step 6: Final answer
    x = 26,457.51

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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.