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Finding the Fourth Proportional to 287.91, 397.31 and 156.92

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Solution

The fourth proportional to 287.91, 397.31 and 156.92 is: 216.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.91 : 397.31 = 156.92 : x
  2. Step 2: Convert to fraction form
    287.91/397.31 = 156.92/x
  3. Step 3: Cross multiply
    287.91x = 397.31 × 156.92
  4. Step 4: Simplify right side
    287.91x = 62,344.29
  5. Step 5: Solve for x
    x = 62,344.29/287.91
  6. Step 6: Final answer
    x = 216.54

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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.