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Finding the Fourth Proportional to 339.40, 505.72 and 303.05

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Solution

The fourth proportional to 339.40, 505.72 and 303.05 is: 451.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.40 : 505.72 = 303.05 : x
  2. Step 2: Convert to fraction form
    339.40/505.72 = 303.05/x
  3. Step 3: Cross multiply
    339.40x = 505.72 × 303.05
  4. Step 4: Simplify right side
    339.40x = 153,260.09
  5. Step 5: Solve for x
    x = 153,260.09/339.40
  6. Step 6: Final answer
    x = 451.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.