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Finding the Fourth Proportional to 268.16, 402.17 and 85.57

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Solution

The fourth proportional to 268.16, 402.17 and 85.57 is: 128.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.16 : 402.17 = 85.57 : x
  2. Step 2: Convert to fraction form
    268.16/402.17 = 85.57/x
  3. Step 3: Cross multiply
    268.16x = 402.17 × 85.57
  4. Step 4: Simplify right side
    268.16x = 34,413.69
  5. Step 5: Solve for x
    x = 34,413.69/268.16
  6. Step 6: Final answer
    x = 128.33

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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.