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Finding the Fourth Proportional to 339.55, 468.72 and 306.20

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Solution

The fourth proportional to 339.55, 468.72 and 306.20 is: 422.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.55 : 468.72 = 306.20 : x
  2. Step 2: Convert to fraction form
    339.55/468.72 = 306.20/x
  3. Step 3: Cross multiply
    339.55x = 468.72 × 306.20
  4. Step 4: Simplify right side
    339.55x = 143,523.24
  5. Step 5: Solve for x
    x = 143,523.24/339.55
  6. Step 6: Final answer
    x = 422.69

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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.