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Finding the Fourth Proportional to 92.87, 128.21 and 60.20

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Solution

The fourth proportional to 92.87, 128.21 and 60.20 is: 83.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.87 : 128.21 = 60.20 : x
  2. Step 2: Convert to fraction form
    92.87/128.21 = 60.20/x
  3. Step 3: Cross multiply
    92.87x = 128.21 × 60.20
  4. Step 4: Simplify right side
    92.87x = 7,718.24
  5. Step 5: Solve for x
    x = 7,718.24/92.87
  6. Step 6: Final answer
    x = 83.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.