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Finding the Fourth Proportional to 403.26, 560.45 and 398.94

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Solution

The fourth proportional to 403.26, 560.45 and 398.94 is: 554.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.26 : 560.45 = 398.94 : x
  2. Step 2: Convert to fraction form
    403.26/560.45 = 398.94/x
  3. Step 3: Cross multiply
    403.26x = 560.45 × 398.94
  4. Step 4: Simplify right side
    403.26x = 223,583.93
  5. Step 5: Solve for x
    x = 223,583.93/403.26
  6. Step 6: Final answer
    x = 554.44

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.