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Finding the Fourth Proportional to 287.91, 397.33 and 171.47

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Solution

The fourth proportional to 287.91, 397.33 and 171.47 is: 236.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.91 : 397.33 = 171.47 : x
  2. Step 2: Convert to fraction form
    287.91/397.33 = 171.47/x
  3. Step 3: Cross multiply
    287.91x = 397.33 × 171.47
  4. Step 4: Simplify right side
    287.91x = 68,130.74
  5. Step 5: Solve for x
    x = 68,130.74/287.91
  6. Step 6: Final answer
    x = 236.64

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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.