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Finding the Fourth Proportional to 287.29, 431.07 and 133.13

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Solution

The fourth proportional to 287.29, 431.07 and 133.13 is: 199.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.29 : 431.07 = 133.13 : x
  2. Step 2: Convert to fraction form
    287.29/431.07 = 133.13/x
  3. Step 3: Cross multiply
    287.29x = 431.07 × 133.13
  4. Step 4: Simplify right side
    287.29x = 57,388.35
  5. Step 5: Solve for x
    x = 57,388.35/287.29
  6. Step 6: Final answer
    x = 199.76

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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.