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Finding the Fourth Proportional to 70,436.67, 105,672.21 and 20,515.96

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Solution

The fourth proportional to 70,436.67, 105,672.21 and 20,515.96 is: 30,778.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,436.67 : 105,672.21 = 20,515.96 : x
  2. Step 2: Convert to fraction form
    70,436.67/105,672.21 = 20,515.96/x
  3. Step 3: Cross multiply
    70,436.67x = 105,672.21 × 20,515.96
  4. Step 4: Simplify right side
    70,436.67x = 2,167,966,833.47
  5. Step 5: Solve for x
    x = 2,167,966,833.47/70,436.67
  6. Step 6: Final answer
    x = 30,778.95

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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.