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Finding the Fourth Proportional to 201.30, 302.01 and 85.69

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Solution

The fourth proportional to 201.30, 302.01 and 85.69 is: 128.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.30 : 302.01 = 85.69 : x
  2. Step 2: Convert to fraction form
    201.30/302.01 = 85.69/x
  3. Step 3: Cross multiply
    201.30x = 302.01 × 85.69
  4. Step 4: Simplify right side
    201.30x = 25,877.73
  5. Step 5: Solve for x
    x = 25,877.73/201.30
  6. Step 6: Final answer
    x = 128.55

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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.