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Finding the Fourth Proportional to 85.67, 128.50 and 24.80

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Solution

The fourth proportional to 85.67, 128.50 and 24.80 is: 37.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.67 : 128.50 = 24.80 : x
  2. Step 2: Convert to fraction form
    85.67/128.50 = 24.80/x
  3. Step 3: Cross multiply
    85.67x = 128.50 × 24.80
  4. Step 4: Simplify right side
    85.67x = 3,186.80
  5. Step 5: Solve for x
    x = 3,186.80/85.67
  6. Step 6: Final answer
    x = 37.20

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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.