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Finding the Fourth Proportional to 431.03, 597.21 and 421.81

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Solution

The fourth proportional to 431.03, 597.21 and 421.81 is: 584.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.03 : 597.21 = 421.81 : x
  2. Step 2: Convert to fraction form
    431.03/597.21 = 421.81/x
  3. Step 3: Cross multiply
    431.03x = 597.21 × 421.81
  4. Step 4: Simplify right side
    431.03x = 251,906.08
  5. Step 5: Solve for x
    x = 251,906.08/431.03
  6. Step 6: Final answer
    x = 584.42

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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.