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Finding the Fourth Proportional to 70,611.72, 105,932.17 and 20,693.45

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Solution

The fourth proportional to 70,611.72, 105,932.17 and 20,693.45 is: 31,044.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,611.72 : 105,932.17 = 20,693.45 : x
  2. Step 2: Convert to fraction form
    70,611.72/105,932.17 = 20,693.45/x
  3. Step 3: Cross multiply
    70,611.72x = 105,932.17 × 20,693.45
  4. Step 4: Simplify right side
    70,611.72x = 2,192,102,063.29
  5. Step 5: Solve for x
    x = 2,192,102,063.29/70,611.72
  6. Step 6: Final answer
    x = 31,044.45

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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.