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Finding the Fourth Proportional to 287.55, 431.01 and 272.36

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Solution

The fourth proportional to 287.55, 431.01 and 272.36 is: 408.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.55 : 431.01 = 272.36 : x
  2. Step 2: Convert to fraction form
    287.55/431.01 = 272.36/x
  3. Step 3: Cross multiply
    287.55x = 431.01 × 272.36
  4. Step 4: Simplify right side
    287.55x = 117,387.73
  5. Step 5: Solve for x
    x = 117,387.73/287.55
  6. Step 6: Final answer
    x = 408.23

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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.