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Finding the Fourth Proportional to 282.71, 390.22 and 172.26

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Solution

The fourth proportional to 282.71, 390.22 and 172.26 is: 237.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.71 : 390.22 = 172.26 : x
  2. Step 2: Convert to fraction form
    282.71/390.22 = 172.26/x
  3. Step 3: Cross multiply
    282.71x = 390.22 × 172.26
  4. Step 4: Simplify right side
    282.71x = 67,218.87
  5. Step 5: Solve for x
    x = 67,218.87/282.71
  6. Step 6: Final answer
    x = 237.76

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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.