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Finding the Fourth Proportional to 85.75, 128.93 and 60.23

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Solution

The fourth proportional to 85.75, 128.93 and 60.23 is: 90.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.75 : 128.93 = 60.23 : x
  2. Step 2: Convert to fraction form
    85.75/128.93 = 60.23/x
  3. Step 3: Cross multiply
    85.75x = 128.93 × 60.23
  4. Step 4: Simplify right side
    85.75x = 7,765.45
  5. Step 5: Solve for x
    x = 7,765.45/85.75
  6. Step 6: Final answer
    x = 90.56

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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.