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Finding the Fourth Proportional to 99,660.70, 149,487.81 and 40,478.86

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Solution

The fourth proportional to 99,660.70, 149,487.81 and 40,478.86 is: 60,716.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,660.70 : 149,487.81 = 40,478.86 : x
  2. Step 2: Convert to fraction form
    99,660.70/149,487.81 = 40,478.86/x
  3. Step 3: Cross multiply
    99,660.70x = 149,487.81 × 40,478.86
  4. Step 4: Simplify right side
    99,660.70x = 6,051,096,132.70
  5. Step 5: Solve for x
    x = 6,051,096,132.70/99,660.70
  6. Step 6: Final answer
    x = 60,716.97

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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.