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Finding the Fourth Proportional to 287.21, 429.60 and 266.43

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Solution

The fourth proportional to 287.21, 429.60 and 266.43 is: 398.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.21 : 429.60 = 266.43 : x
  2. Step 2: Convert to fraction form
    287.21/429.60 = 266.43/x
  3. Step 3: Cross multiply
    287.21x = 429.60 × 266.43
  4. Step 4: Simplify right side
    287.21x = 114,458.33
  5. Step 5: Solve for x
    x = 114,458.33/287.21
  6. Step 6: Final answer
    x = 398.52

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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.