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Finding the Fourth Proportional to 282.72, 390.38 and 220.49

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Solution

The fourth proportional to 282.72, 390.38 and 220.49 is: 304.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.72 : 390.38 = 220.49 : x
  2. Step 2: Convert to fraction form
    282.72/390.38 = 220.49/x
  3. Step 3: Cross multiply
    282.72x = 390.38 × 220.49
  4. Step 4: Simplify right side
    282.72x = 86,074.89
  5. Step 5: Solve for x
    x = 86,074.89/282.72
  6. Step 6: Final answer
    x = 304.45

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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.