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Finding the Fourth Proportional to 70,350.96, 105,531.92 and 20,431.86

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Solution

The fourth proportional to 70,350.96, 105,531.92 and 20,431.86 is: 30,649.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,350.96 : 105,531.92 = 20,431.86 : x
  2. Step 2: Convert to fraction form
    70,350.96/105,531.92 = 20,431.86/x
  3. Step 3: Cross multiply
    70,350.96x = 105,531.92 × 20,431.86
  4. Step 4: Simplify right side
    70,350.96x = 2,156,213,414.97
  5. Step 5: Solve for x
    x = 2,156,213,414.97/70,350.96
  6. Step 6: Final answer
    x = 30,649.38

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1.5x scale

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.