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Finding the Fourth Proportional to 282.89, 390.42 and 172.39

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Solution

The fourth proportional to 282.89, 390.42 and 172.39 is: 237.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.89 : 390.42 = 172.39 : x
  2. Step 2: Convert to fraction form
    282.89/390.42 = 172.39/x
  3. Step 3: Cross multiply
    282.89x = 390.42 × 172.39
  4. Step 4: Simplify right side
    282.89x = 67,304.50
  5. Step 5: Solve for x
    x = 67,304.50/282.89
  6. Step 6: Final answer
    x = 237.92

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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.