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Finding the Fourth Proportional to 86.02, 128.75 and 74.14

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Solution

The fourth proportional to 86.02, 128.75 and 74.14 is: 110.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.02 : 128.75 = 74.14 : x
  2. Step 2: Convert to fraction form
    86.02/128.75 = 74.14/x
  3. Step 3: Cross multiply
    86.02x = 128.75 × 74.14
  4. Step 4: Simplify right side
    86.02x = 9,545.53
  5. Step 5: Solve for x
    x = 9,545.53/86.02
  6. Step 6: Final answer
    x = 110.97

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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.