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Finding the Fourth Proportional to 356.10, 491.45 and 208.66

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Solution

The fourth proportional to 356.10, 491.45 and 208.66 is: 287.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.10 : 491.45 = 208.66 : x
  2. Step 2: Convert to fraction form
    356.10/491.45 = 208.66/x
  3. Step 3: Cross multiply
    356.10x = 491.45 × 208.66
  4. Step 4: Simplify right side
    356.10x = 102,545.96
  5. Step 5: Solve for x
    x = 102,545.96/356.10
  6. Step 6: Final answer
    x = 287.97

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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.