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Finding the Fourth Proportional to 302.90, 415.28 and 297.43

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Solution

The fourth proportional to 302.90, 415.28 and 297.43 is: 407.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.90 : 415.28 = 297.43 : x
  2. Step 2: Convert to fraction form
    302.90/415.28 = 297.43/x
  3. Step 3: Cross multiply
    302.90x = 415.28 × 297.43
  4. Step 4: Simplify right side
    302.90x = 123,517.03
  5. Step 5: Solve for x
    x = 123,517.03/302.90
  6. Step 6: Final answer
    x = 407.78

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.