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Finding the Fourth Proportional to 287.72, 431.22 and 143.48

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Solution

The fourth proportional to 287.72, 431.22 and 143.48 is: 215.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.72 : 431.22 = 143.48 : x
  2. Step 2: Convert to fraction form
    287.72/431.22 = 143.48/x
  3. Step 3: Cross multiply
    287.72x = 431.22 × 143.48
  4. Step 4: Simplify right side
    287.72x = 61,871.45
  5. Step 5: Solve for x
    x = 61,871.45/287.72
  6. Step 6: Final answer
    x = 215.04

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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.