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Finding the Fourth Proportional to 218.96, 328.44 and 90.68

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Solution

The fourth proportional to 218.96, 328.44 and 90.68 is: 136.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.96 : 328.44 = 90.68 : x
  2. Step 2: Convert to fraction form
    218.96/328.44 = 90.68/x
  3. Step 3: Cross multiply
    218.96x = 328.44 × 90.68
  4. Step 4: Simplify right side
    218.96x = 29,782.94
  5. Step 5: Solve for x
    x = 29,782.94/218.96
  6. Step 6: Final answer
    x = 136.02

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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.