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Finding the Fourth Proportional to 478.34, 717.42 and 218.28

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Solution

The fourth proportional to 478.34, 717.42 and 218.28 is: 327.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.34 : 717.42 = 218.28 : x
  2. Step 2: Convert to fraction form
    478.34/717.42 = 218.28/x
  3. Step 3: Cross multiply
    478.34x = 717.42 × 218.28
  4. Step 4: Simplify right side
    478.34x = 156,600.02
  5. Step 5: Solve for x
    x = 156,600.02/478.34
  6. Step 6: Final answer
    x = 327.38

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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.