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Finding the Fourth Proportional to 478.53, 717.99 and 218.66

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Solution

The fourth proportional to 478.53, 717.99 and 218.66 is: 328.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.53 : 717.99 = 218.66 : x
  2. Step 2: Convert to fraction form
    478.53/717.99 = 218.66/x
  3. Step 3: Cross multiply
    478.53x = 717.99 × 218.66
  4. Step 4: Simplify right side
    478.53x = 156,991.28
  5. Step 5: Solve for x
    x = 156,991.28/478.53
  6. Step 6: Final answer
    x = 328.07

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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.