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Finding the Fourth Proportional to 491.66, 736.80 and 217.68

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Solution

The fourth proportional to 491.66, 736.80 and 217.68 is: 326.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.66 : 736.80 = 217.68 : x
  2. Step 2: Convert to fraction form
    491.66/736.80 = 217.68/x
  3. Step 3: Cross multiply
    491.66x = 736.80 × 217.68
  4. Step 4: Simplify right side
    491.66x = 160,383.04
  5. Step 5: Solve for x
    x = 160,383.04/491.66
  6. Step 6: Final answer
    x = 326.21

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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.