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Finding the Fourth Proportional to 399.32, 547 and 395

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Solution

The fourth proportional to 399.32, 547 and 395 is: 541.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.32 : 547 = 395 : x
  2. Step 2: Convert to fraction form
    399.32/547 = 395/x
  3. Step 3: Cross multiply
    399.32x = 547 × 395
  4. Step 4: Simplify right side
    399.32x = 216,065
  5. Step 5: Solve for x
    x = 216,065/399.32
  6. Step 6: Final answer
    x = 541.08

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These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.