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Finding the Fourth Proportional to 218.63, 328.07 and 96.90

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Solution

The fourth proportional to 218.63, 328.07 and 96.90 is: 145.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.63 : 328.07 = 96.90 : x
  2. Step 2: Convert to fraction form
    218.63/328.07 = 96.90/x
  3. Step 3: Cross multiply
    218.63x = 328.07 × 96.90
  4. Step 4: Simplify right side
    218.63x = 31,789.50
  5. Step 5: Solve for x
    x = 31,789.50/218.63
  6. Step 6: Final answer
    x = 145.41

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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.