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Finding the Fourth Proportional to 217.09, 325.40 and 99.88

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Solution

The fourth proportional to 217.09, 325.40 and 99.88 is: 149.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.09 : 325.40 = 99.88 : x
  2. Step 2: Convert to fraction form
    217.09/325.40 = 99.88/x
  3. Step 3: Cross multiply
    217.09x = 325.40 × 99.88
  4. Step 4: Simplify right side
    217.09x = 32,499.64
  5. Step 5: Solve for x
    x = 32,499.64/217.09
  6. Step 6: Final answer
    x = 149.70

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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.