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Finding the Fourth Proportional to 338.30, 506.90 and 305.90

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Solution

The fourth proportional to 338.30, 506.90 and 305.90 is: 458.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.30 : 506.90 = 305.90 : x
  2. Step 2: Convert to fraction form
    338.30/506.90 = 305.90/x
  3. Step 3: Cross multiply
    338.30x = 506.90 × 305.90
  4. Step 4: Simplify right side
    338.30x = 155,060.71
  5. Step 5: Solve for x
    x = 155,060.71/338.30
  6. Step 6: Final answer
    x = 458.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.