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Finding the Fourth Proportional to 287.44, 431.16 and 206.32

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Solution

The fourth proportional to 287.44, 431.16 and 206.32 is: 309.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.44 : 431.16 = 206.32 : x
  2. Step 2: Convert to fraction form
    287.44/431.16 = 206.32/x
  3. Step 3: Cross multiply
    287.44x = 431.16 × 206.32
  4. Step 4: Simplify right side
    287.44x = 88,956.93
  5. Step 5: Solve for x
    x = 88,956.93/287.44
  6. Step 6: Final answer
    x = 309.48

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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.