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Finding the Fourth Proportional to 287.41, 431.08 and 92.41

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Solution

The fourth proportional to 287.41, 431.08 and 92.41 is: 138.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.41 : 431.08 = 92.41 : x
  2. Step 2: Convert to fraction form
    287.41/431.08 = 92.41/x
  3. Step 3: Cross multiply
    287.41x = 431.08 × 92.41
  4. Step 4: Simplify right side
    287.41x = 39,836.10
  5. Step 5: Solve for x
    x = 39,836.10/287.41
  6. Step 6: Final answer
    x = 138.60

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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.