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Finding the Fourth Proportional to 287.58, 431.42 and 125.38

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Solution

The fourth proportional to 287.58, 431.42 and 125.38 is: 188.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.58 : 431.42 = 125.38 : x
  2. Step 2: Convert to fraction form
    287.58/431.42 = 125.38/x
  3. Step 3: Cross multiply
    287.58x = 431.42 × 125.38
  4. Step 4: Simplify right side
    287.58x = 54,091.44
  5. Step 5: Solve for x
    x = 54,091.44/287.58
  6. Step 6: Final answer
    x = 188.09

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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.