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Finding the Fourth Proportional to 403.45, 607.80 and 398.41

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Solution

The fourth proportional to 403.45, 607.80 and 398.41 is: 600.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.45 : 607.80 = 398.41 : x
  2. Step 2: Convert to fraction form
    403.45/607.80 = 398.41/x
  3. Step 3: Cross multiply
    403.45x = 607.80 × 398.41
  4. Step 4: Simplify right side
    403.45x = 242,150.58
  5. Step 5: Solve for x
    x = 242,150.58/403.45
  6. Step 6: Final answer
    x = 600.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.