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Finding the Fourth Proportional to 282.45, 390.28 and 217.52

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Solution

The fourth proportional to 282.45, 390.28 and 217.52 is: 300.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.45 : 390.28 = 217.52 : x
  2. Step 2: Convert to fraction form
    282.45/390.28 = 217.52/x
  3. Step 3: Cross multiply
    282.45x = 390.28 × 217.52
  4. Step 4: Simplify right side
    282.45x = 84,893.71
  5. Step 5: Solve for x
    x = 84,893.71/282.45
  6. Step 6: Final answer
    x = 300.56

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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.