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Finding the Fourth Proportional to 399.83, 598.20 and 398.80

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Solution

The fourth proportional to 399.83, 598.20 and 398.80 is: 596.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.83 : 598.20 = 398.80 : x
  2. Step 2: Convert to fraction form
    399.83/598.20 = 398.80/x
  3. Step 3: Cross multiply
    399.83x = 598.20 × 398.80
  4. Step 4: Simplify right side
    399.83x = 238,562.16
  5. Step 5: Solve for x
    x = 238,562.16/399.83
  6. Step 6: Final answer
    x = 596.66

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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.