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Finding the Fourth Proportional to 79,388.64, 119,141.28 and 39,906

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Solution

The fourth proportional to 79,388.64, 119,141.28 and 39,906 is: 59,888.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,388.64 : 119,141.28 = 39,906 : x
  2. Step 2: Convert to fraction form
    79,388.64/119,141.28 = 39,906/x
  3. Step 3: Cross multiply
    79,388.64x = 119,141.28 × 39,906
  4. Step 4: Simplify right side
    79,388.64x = 4,754,451,919.68
  5. Step 5: Solve for x
    x = 4,754,451,919.68/79,388.64
  6. Step 6: Final answer
    x = 59,888.32

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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.