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Finding the Fourth Proportional to 287.63, 431.38 and 133.41

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Solution

The fourth proportional to 287.63, 431.38 and 133.41 is: 200.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.63 : 431.38 = 133.41 : x
  2. Step 2: Convert to fraction form
    287.63/431.38 = 133.41/x
  3. Step 3: Cross multiply
    287.63x = 431.38 × 133.41
  4. Step 4: Simplify right side
    287.63x = 57,551.83
  5. Step 5: Solve for x
    x = 57,551.83/287.63
  6. Step 6: Final answer
    x = 200.09

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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.