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Finding the Fourth Proportional to 282.84, 390.36 and 172.38

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Solution

The fourth proportional to 282.84, 390.36 and 172.38 is: 237.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.84 : 390.36 = 172.38 : x
  2. Step 2: Convert to fraction form
    282.84/390.36 = 172.38/x
  3. Step 3: Cross multiply
    282.84x = 390.36 × 172.38
  4. Step 4: Simplify right side
    282.84x = 67,290.26
  5. Step 5: Solve for x
    x = 67,290.26/282.84
  6. Step 6: Final answer
    x = 237.91

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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.