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Finding the Fourth Proportional to 287.88, 431.78 and 214.85

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Solution

The fourth proportional to 287.88, 431.78 and 214.85 is: 322.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.88 : 431.78 = 214.85 : x
  2. Step 2: Convert to fraction form
    287.88/431.78 = 214.85/x
  3. Step 3: Cross multiply
    287.88x = 431.78 × 214.85
  4. Step 4: Simplify right side
    287.88x = 92,767.93
  5. Step 5: Solve for x
    x = 92,767.93/287.88
  6. Step 6: Final answer
    x = 322.25

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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.