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Finding the Fourth Proportional to 318.39, 477.26 and 215.42

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Solution

The fourth proportional to 318.39, 477.26 and 215.42 is: 322.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.39 : 477.26 = 215.42 : x
  2. Step 2: Convert to fraction form
    318.39/477.26 = 215.42/x
  3. Step 3: Cross multiply
    318.39x = 477.26 × 215.42
  4. Step 4: Simplify right side
    318.39x = 102,811.47
  5. Step 5: Solve for x
    x = 102,811.47/318.39
  6. Step 6: Final answer
    x = 322.91

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.