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Finding the Fourth Proportional to 478.30, 716.90 and 221.26

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Solution

The fourth proportional to 478.30, 716.90 and 221.26 is: 331.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.30 : 716.90 = 221.26 : x
  2. Step 2: Convert to fraction form
    478.30/716.90 = 221.26/x
  3. Step 3: Cross multiply
    478.30x = 716.90 × 221.26
  4. Step 4: Simplify right side
    478.30x = 158,621.29
  5. Step 5: Solve for x
    x = 158,621.29/478.30
  6. Step 6: Final answer
    x = 331.64

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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.