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Finding the Fourth Proportional to 538, 806.80 and 318.68

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Solution

The fourth proportional to 538, 806.80 and 318.68 is: 477.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    538 : 806.80 = 318.68 : x
  2. Step 2: Convert to fraction form
    538/806.80 = 318.68/x
  3. Step 3: Cross multiply
    538x = 806.80 × 318.68
  4. Step 4: Simplify right side
    538x = 257,111.02
  5. Step 5: Solve for x
    x = 257,111.02/538
  6. Step 6: Final answer
    x = 477.90

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