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Finding the Fourth Proportional to 318.65, 438.82 and 220.24

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Solution

The fourth proportional to 318.65, 438.82 and 220.24 is: 303.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.65 : 438.82 = 220.24 : x
  2. Step 2: Convert to fraction form
    318.65/438.82 = 220.24/x
  3. Step 3: Cross multiply
    318.65x = 438.82 × 220.24
  4. Step 4: Simplify right side
    318.65x = 96,643.25
  5. Step 5: Solve for x
    x = 96,643.25/318.65
  6. Step 6: Final answer
    x = 303.29

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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.