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Finding the Fourth Proportional to 287.11, 428.72 and 270.87

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Solution

The fourth proportional to 287.11, 428.72 and 270.87 is: 404.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.11 : 428.72 = 270.87 : x
  2. Step 2: Convert to fraction form
    287.11/428.72 = 270.87/x
  3. Step 3: Cross multiply
    287.11x = 428.72 × 270.87
  4. Step 4: Simplify right side
    287.11x = 116,125.93
  5. Step 5: Solve for x
    x = 116,125.93/287.11
  6. Step 6: Final answer
    x = 404.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.