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Finding the Fourth Proportional to 301.72, 415.98 and 208.30

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Solution

The fourth proportional to 301.72, 415.98 and 208.30 is: 287.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.72 : 415.98 = 208.30 : x
  2. Step 2: Convert to fraction form
    301.72/415.98 = 208.30/x
  3. Step 3: Cross multiply
    301.72x = 415.98 × 208.30
  4. Step 4: Simplify right side
    301.72x = 86,648.63
  5. Step 5: Solve for x
    x = 86,648.63/301.72
  6. Step 6: Final answer
    x = 287.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.