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Finding the Fourth Proportional to 287.21, 431.26 and 232.58

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Solution

The fourth proportional to 287.21, 431.26 and 232.58 is: 349.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.21 : 431.26 = 232.58 : x
  2. Step 2: Convert to fraction form
    287.21/431.26 = 232.58/x
  3. Step 3: Cross multiply
    287.21x = 431.26 × 232.58
  4. Step 4: Simplify right side
    287.21x = 100,301.95
  5. Step 5: Solve for x
    x = 100,301.95/287.21
  6. Step 6: Final answer
    x = 349.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.