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Finding the Fourth Proportional to 72,989.31, 100,725.32 and 42,768.62

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Solution

The fourth proportional to 72,989.31, 100,725.32 and 42,768.62 is: 59,020.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,989.31 : 100,725.32 = 42,768.62 : x
  2. Step 2: Convert to fraction form
    72,989.31/100,725.32 = 42,768.62/x
  3. Step 3: Cross multiply
    72,989.31x = 100,725.32 × 42,768.62
  4. Step 4: Simplify right side
    72,989.31x = 4,307,882,217.99
  5. Step 5: Solve for x
    x = 4,307,882,217.99/72,989.31
  6. Step 6: Final answer
    x = 59,020.73

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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.