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Finding the Fourth Proportional to 325.86, 488.78 and 109.45

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Solution

The fourth proportional to 325.86, 488.78 and 109.45 is: 164.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.86 : 488.78 = 109.45 : x
  2. Step 2: Convert to fraction form
    325.86/488.78 = 109.45/x
  3. Step 3: Cross multiply
    325.86x = 488.78 × 109.45
  4. Step 4: Simplify right side
    325.86x = 53,496.97
  5. Step 5: Solve for x
    x = 53,496.97/325.86
  6. Step 6: Final answer
    x = 164.17

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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.