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Finding the Fourth Proportional to 338.26, 508.55 and 312.90

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Solution

The fourth proportional to 338.26, 508.55 and 312.90 is: 470.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.26 : 508.55 = 312.90 : x
  2. Step 2: Convert to fraction form
    338.26/508.55 = 312.90/x
  3. Step 3: Cross multiply
    338.26x = 508.55 × 312.90
  4. Step 4: Simplify right side
    338.26x = 159,126.61
  5. Step 5: Solve for x
    x = 159,126.61/338.26
  6. Step 6: Final answer
    x = 470.42

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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.