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Finding the Fourth Proportional to 218.78, 328.17 and 110.51

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Solution

The fourth proportional to 218.78, 328.17 and 110.51 is: 165.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.78 : 328.17 = 110.51 : x
  2. Step 2: Convert to fraction form
    218.78/328.17 = 110.51/x
  3. Step 3: Cross multiply
    218.78x = 328.17 × 110.51
  4. Step 4: Simplify right side
    218.78x = 36,266.07
  5. Step 5: Solve for x
    x = 36,266.07/218.78
  6. Step 6: Final answer
    x = 165.77

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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.