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Finding the Fourth Proportional to 99,940.92, 137,683.92 and 69,671.16

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Solution

The fourth proportional to 99,940.92, 137,683.92 and 69,671.16 is: 95,982.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,940.92 : 137,683.92 = 69,671.16 : x
  2. Step 2: Convert to fraction form
    99,940.92/137,683.92 = 69,671.16/x
  3. Step 3: Cross multiply
    99,940.92x = 137,683.92 × 69,671.16
  4. Step 4: Simplify right side
    99,940.92x = 9,592,598,419.75
  5. Step 5: Solve for x
    x = 9,592,598,419.75/99,940.92
  6. Step 6: Final answer
    x = 95,982.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.