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Finding the Fourth Proportional to 478.31, 717.46 and 218.40

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Solution

The fourth proportional to 478.31, 717.46 and 218.40 is: 327.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.31 : 717.46 = 218.40 : x
  2. Step 2: Convert to fraction form
    478.31/717.46 = 218.40/x
  3. Step 3: Cross multiply
    478.31x = 717.46 × 218.40
  4. Step 4: Simplify right side
    478.31x = 156,693.26
  5. Step 5: Solve for x
    x = 156,693.26/478.31
  6. Step 6: Final answer
    x = 327.60

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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.