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Finding the Fourth Proportional to 218.81, 328.35 and 97.08

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Solution

The fourth proportional to 218.81, 328.35 and 97.08 is: 145.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.81 : 328.35 = 97.08 : x
  2. Step 2: Convert to fraction form
    218.81/328.35 = 97.08/x
  3. Step 3: Cross multiply
    218.81x = 328.35 × 97.08
  4. Step 4: Simplify right side
    218.81x = 31,874.80
  5. Step 5: Solve for x
    x = 31,874.80/218.81
  6. Step 6: Final answer
    x = 145.67

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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.