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Finding the Fourth Proportional to 287.67, 431.40 and 95.25

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Solution

The fourth proportional to 287.67, 431.40 and 95.25 is: 142.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.67 : 431.40 = 95.25 : x
  2. Step 2: Convert to fraction form
    287.67/431.40 = 95.25/x
  3. Step 3: Cross multiply
    287.67x = 431.40 × 95.25
  4. Step 4: Simplify right side
    287.67x = 41,090.85
  5. Step 5: Solve for x
    x = 41,090.85/287.67
  6. Step 6: Final answer
    x = 142.84

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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.