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Finding the Fourth Proportional to 356, 491.29 and 218

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Solution

The fourth proportional to 356, 491.29 and 218 is: 300.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    356 : 491.29 = 218 : x
  2. Step 2: Convert to fraction form
    356/491.29 = 218/x
  3. Step 3: Cross multiply
    356x = 491.29 × 218
  4. Step 4: Simplify right side
    356x = 107,100.13
  5. Step 5: Solve for x
    x = 107,100.13/356
  6. Step 6: Final answer
    x = 300.84

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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.