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Finding the Fourth Proportional to 302.90, 418.29 and 291.62

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Solution

The fourth proportional to 302.90, 418.29 and 291.62 is: 402.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.90 : 418.29 = 291.62 : x
  2. Step 2: Convert to fraction form
    302.90/418.29 = 291.62/x
  3. Step 3: Cross multiply
    302.90x = 418.29 × 291.62
  4. Step 4: Simplify right side
    302.90x = 121,979.64
  5. Step 5: Solve for x
    x = 121,979.64/302.90
  6. Step 6: Final answer
    x = 402.71

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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.