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Finding the Fourth Proportional to 356.13, 533.66 and 209.61

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Solution

The fourth proportional to 356.13, 533.66 and 209.61 is: 314.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.13 : 533.66 = 209.61 : x
  2. Step 2: Convert to fraction form
    356.13/533.66 = 209.61/x
  3. Step 3: Cross multiply
    356.13x = 533.66 × 209.61
  4. Step 4: Simplify right side
    356.13x = 111,859.42
  5. Step 5: Solve for x
    x = 111,859.42/356.13
  6. Step 6: Final answer
    x = 314.10

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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.