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Finding the Fourth Proportional to 231.18, 318.15 and 215.34

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Solution

The fourth proportional to 231.18, 318.15 and 215.34 is: 296.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.18 : 318.15 = 215.34 : x
  2. Step 2: Convert to fraction form
    231.18/318.15 = 215.34/x
  3. Step 3: Cross multiply
    231.18x = 318.15 × 215.34
  4. Step 4: Simplify right side
    231.18x = 68,510.42
  5. Step 5: Solve for x
    x = 68,510.42/231.18
  6. Step 6: Final answer
    x = 296.35

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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.