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Finding the Fourth Proportional to 305.91, 422.07 and 290.52

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Solution

The fourth proportional to 305.91, 422.07 and 290.52 is: 400.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.91 : 422.07 = 290.52 : x
  2. Step 2: Convert to fraction form
    305.91/422.07 = 290.52/x
  3. Step 3: Cross multiply
    305.91x = 422.07 × 290.52
  4. Step 4: Simplify right side
    305.91x = 122,619.78
  5. Step 5: Solve for x
    x = 122,619.78/305.91
  6. Step 6: Final answer
    x = 400.84

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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.