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Finding the Fourth Proportional to 268.47, 402.67 and 85.84

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Solution

The fourth proportional to 268.47, 402.67 and 85.84 is: 128.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.47 : 402.67 = 85.84 : x
  2. Step 2: Convert to fraction form
    268.47/402.67 = 85.84/x
  3. Step 3: Cross multiply
    268.47x = 402.67 × 85.84
  4. Step 4: Simplify right side
    268.47x = 34,565.19
  5. Step 5: Solve for x
    x = 34,565.19/268.47
  6. Step 6: Final answer
    x = 128.75

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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.