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Finding the Fourth Proportional to 287.01, 429.88 and 221.54

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Solution

The fourth proportional to 287.01, 429.88 and 221.54 is: 331.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.01 : 429.88 = 221.54 : x
  2. Step 2: Convert to fraction form
    287.01/429.88 = 221.54/x
  3. Step 3: Cross multiply
    287.01x = 429.88 × 221.54
  4. Step 4: Simplify right side
    287.01x = 95,232.91
  5. Step 5: Solve for x
    x = 95,232.91/287.01
  6. Step 6: Final answer
    x = 331.81

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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.