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Finding the Fourth Proportional to 287.43, 431.21 and 92.43

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Solution

The fourth proportional to 287.43, 431.21 and 92.43 is: 138.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.43 : 431.21 = 92.43 : x
  2. Step 2: Convert to fraction form
    287.43/431.21 = 92.43/x
  3. Step 3: Cross multiply
    287.43x = 431.21 × 92.43
  4. Step 4: Simplify right side
    287.43x = 39,856.28
  5. Step 5: Solve for x
    x = 39,856.28/287.43
  6. Step 6: Final answer
    x = 138.66

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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.