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Finding the Fourth Proportional to 306.04, 422.12 and 287.16

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Solution

The fourth proportional to 306.04, 422.12 and 287.16 is: 396.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.04 : 422.12 = 287.16 : x
  2. Step 2: Convert to fraction form
    306.04/422.12 = 287.16/x
  3. Step 3: Cross multiply
    306.04x = 422.12 × 287.16
  4. Step 4: Simplify right side
    306.04x = 121,215.98
  5. Step 5: Solve for x
    x = 121,215.98/306.04
  6. Step 6: Final answer
    x = 396.08

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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.