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Finding the Fourth Proportional to 478.18, 716.66 and 231.34

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Solution

The fourth proportional to 478.18, 716.66 and 231.34 is: 346.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.18 : 716.66 = 231.34 : x
  2. Step 2: Convert to fraction form
    478.18/716.66 = 231.34/x
  3. Step 3: Cross multiply
    478.18x = 716.66 × 231.34
  4. Step 4: Simplify right side
    478.18x = 165,788.54
  5. Step 5: Solve for x
    x = 165,788.54/478.18
  6. Step 6: Final answer
    x = 346.71

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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.