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Finding the Fourth Proportional to 85.35, 127.89 and 52.86

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Solution

The fourth proportional to 85.35, 127.89 and 52.86 is: 79.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.35 : 127.89 = 52.86 : x
  2. Step 2: Convert to fraction form
    85.35/127.89 = 52.86/x
  3. Step 3: Cross multiply
    85.35x = 127.89 × 52.86
  4. Step 4: Simplify right side
    85.35x = 6,760.27
  5. Step 5: Solve for x
    x = 6,760.27/85.35
  6. Step 6: Final answer
    x = 79.21

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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.