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Finding the Fourth Proportional to 218.95, 328.43 and 97.19

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Solution

The fourth proportional to 218.95, 328.43 and 97.19 is: 145.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.95 : 328.43 = 97.19 : x
  2. Step 2: Convert to fraction form
    218.95/328.43 = 97.19/x
  3. Step 3: Cross multiply
    218.95x = 328.43 × 97.19
  4. Step 4: Simplify right side
    218.95x = 31,918.71
  5. Step 5: Solve for x
    x = 31,918.71/218.95
  6. Step 6: Final answer
    x = 145.78

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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.