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Finding the Fourth Proportional to 356, 491.28 and 268.96

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Solution

The fourth proportional to 356, 491.28 and 268.96 is: 371.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    356 : 491.28 = 268.96 : x
  2. Step 2: Convert to fraction form
    356/491.28 = 268.96/x
  3. Step 3: Cross multiply
    356x = 491.28 × 268.96
  4. Step 4: Simplify right side
    356x = 132,134.67
  5. Step 5: Solve for x
    x = 132,134.67/356
  6. Step 6: Final answer
    x = 371.16

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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.