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Finding the Fourth Proportional to 312.91, 468.87 and 215.45

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Solution

The fourth proportional to 312.91, 468.87 and 215.45 is: 322.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.91 : 468.87 = 215.45 : x
  2. Step 2: Convert to fraction form
    312.91/468.87 = 215.45/x
  3. Step 3: Cross multiply
    312.91x = 468.87 × 215.45
  4. Step 4: Simplify right side
    312.91x = 101,016.65
  5. Step 5: Solve for x
    x = 101,016.65/312.91
  6. Step 6: Final answer
    x = 322.83

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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.