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Finding the Fourth Proportional to 268.68, 402.66 and 261.72

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Solution

The fourth proportional to 268.68, 402.66 and 261.72 is: 392.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.68 : 402.66 = 261.72 : x
  2. Step 2: Convert to fraction form
    268.68/402.66 = 261.72/x
  3. Step 3: Cross multiply
    268.68x = 402.66 × 261.72
  4. Step 4: Simplify right side
    268.68x = 105,384.18
  5. Step 5: Solve for x
    x = 105,384.18/268.68
  6. Step 6: Final answer
    x = 392.23

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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.