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Finding the Fourth Proportional to 72,689.87, 100,297.32 and 42,469.36

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Solution

The fourth proportional to 72,689.87, 100,297.32 and 42,469.36 is: 58,599.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,689.87 : 100,297.32 = 42,469.36 : x
  2. Step 2: Convert to fraction form
    72,689.87/100,297.32 = 42,469.36/x
  3. Step 3: Cross multiply
    72,689.87x = 100,297.32 × 42,469.36
  4. Step 4: Simplify right side
    72,689.87x = 4,259,562,990.12
  5. Step 5: Solve for x
    x = 4,259,562,990.12/72,689.87
  6. Step 6: Final answer
    x = 58,599.13

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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.