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Finding the Fourth Proportional to 282.78, 390.25 and 172.15

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Solution

The fourth proportional to 282.78, 390.25 and 172.15 is: 237.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.78 : 390.25 = 172.15 : x
  2. Step 2: Convert to fraction form
    282.78/390.25 = 172.15/x
  3. Step 3: Cross multiply
    282.78x = 390.25 × 172.15
  4. Step 4: Simplify right side
    282.78x = 67,181.54
  5. Step 5: Solve for x
    x = 67,181.54/282.78
  6. Step 6: Final answer
    x = 237.58

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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.