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Finding the Fourth Proportional to 287.72, 431.51 and 95.32

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Solution

The fourth proportional to 287.72, 431.51 and 95.32 is: 142.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.72 : 431.51 = 95.32 : x
  2. Step 2: Convert to fraction form
    287.72/431.51 = 95.32/x
  3. Step 3: Cross multiply
    287.72x = 431.51 × 95.32
  4. Step 4: Simplify right side
    287.72x = 41,131.53
  5. Step 5: Solve for x
    x = 41,131.53/287.72
  6. Step 6: Final answer
    x = 142.96

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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.