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Finding the Fourth Proportional to 282.78, 390.36 and 179.28

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Solution

The fourth proportional to 282.78, 390.36 and 179.28 is: 247.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.78 : 390.36 = 179.28 : x
  2. Step 2: Convert to fraction form
    282.78/390.36 = 179.28/x
  3. Step 3: Cross multiply
    282.78x = 390.36 × 179.28
  4. Step 4: Simplify right side
    282.78x = 69,983.74
  5. Step 5: Solve for x
    x = 69,983.74/282.78
  6. Step 6: Final answer
    x = 247.48

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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.