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Finding the Fourth Proportional to 399.12, 598.52 and 254.80

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Solution

The fourth proportional to 399.12, 598.52 and 254.80 is: 382.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.12 : 598.52 = 254.80 : x
  2. Step 2: Convert to fraction form
    399.12/598.52 = 254.80/x
  3. Step 3: Cross multiply
    399.12x = 598.52 × 254.80
  4. Step 4: Simplify right side
    399.12x = 152,502.90
  5. Step 5: Solve for x
    x = 152,502.90/399.12
  6. Step 6: Final answer
    x = 382.10

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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.