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Finding the Fourth Proportional to 70,508.40, 105,728.57 and 40,933.68

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Solution

The fourth proportional to 70,508.40, 105,728.57 and 40,933.68 is: 61,380.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,508.40 : 105,728.57 = 40,933.68 : x
  2. Step 2: Convert to fraction form
    70,508.40/105,728.57 = 40,933.68/x
  3. Step 3: Cross multiply
    70,508.40x = 105,728.57 × 40,933.68
  4. Step 4: Simplify right side
    70,508.40x = 4,327,859,451.24
  5. Step 5: Solve for x
    x = 4,327,859,451.24/70,508.40
  6. Step 6: Final answer
    x = 61,380.76

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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.