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Finding the Fourth Proportional to 85, 127.72 and 46.50

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Solution

The fourth proportional to 85, 127.72 and 46.50 is: 69.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    85 : 127.72 = 46.50 : x
  2. Step 2: Convert to fraction form
    85/127.72 = 46.50/x
  3. Step 3: Cross multiply
    85x = 127.72 × 46.50
  4. Step 4: Simplify right side
    85x = 5,938.98
  5. Step 5: Solve for x
    x = 5,938.98/85
  6. Step 6: Final answer
    x = 69.87

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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.