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Finding the Fourth Proportional to 286.26, 395.04 and 155.28

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Solution

The fourth proportional to 286.26, 395.04 and 155.28 is: 214.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.26 : 395.04 = 155.28 : x
  2. Step 2: Convert to fraction form
    286.26/395.04 = 155.28/x
  3. Step 3: Cross multiply
    286.26x = 395.04 × 155.28
  4. Step 4: Simplify right side
    286.26x = 61,341.81
  5. Step 5: Solve for x
    x = 61,341.81/286.26
  6. Step 6: Final answer
    x = 214.29

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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.