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Finding the Fourth Proportional to 338.76, 508.18 and 318.51

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Solution

The fourth proportional to 338.76, 508.18 and 318.51 is: 477.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.76 : 508.18 = 318.51 : x
  2. Step 2: Convert to fraction form
    338.76/508.18 = 318.51/x
  3. Step 3: Cross multiply
    338.76x = 508.18 × 318.51
  4. Step 4: Simplify right side
    338.76x = 161,860.41
  5. Step 5: Solve for x
    x = 161,860.41/338.76
  6. Step 6: Final answer
    x = 477.80

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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.