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Finding the Fourth Proportional to 331.29, 457.18 and 215.05

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Solution

The fourth proportional to 331.29, 457.18 and 215.05 is: 296.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.29 : 457.18 = 215.05 : x
  2. Step 2: Convert to fraction form
    331.29/457.18 = 215.05/x
  3. Step 3: Cross multiply
    331.29x = 457.18 × 215.05
  4. Step 4: Simplify right side
    331.29x = 98,315.48
  5. Step 5: Solve for x
    x = 98,315.48/331.29
  6. Step 6: Final answer
    x = 296.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.