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Finding the Fourth Proportional to 302.80, 417.48 and 287.44

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Solution

The fourth proportional to 302.80, 417.48 and 287.44 is: 396.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.80 : 417.48 = 287.44 : x
  2. Step 2: Convert to fraction form
    302.80/417.48 = 287.44/x
  3. Step 3: Cross multiply
    302.80x = 417.48 × 287.44
  4. Step 4: Simplify right side
    302.80x = 120,000.45
  5. Step 5: Solve for x
    x = 120,000.45/302.80
  6. Step 6: Final answer
    x = 396.30

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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.