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Finding the Fourth Proportional to 425.17, 638.21 and 357.42

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Solution

The fourth proportional to 425.17, 638.21 and 357.42 is: 536.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.17 : 638.21 = 357.42 : x
  2. Step 2: Convert to fraction form
    425.17/638.21 = 357.42/x
  3. Step 3: Cross multiply
    425.17x = 638.21 × 357.42
  4. Step 4: Simplify right side
    425.17x = 228,109.02
  5. Step 5: Solve for x
    x = 228,109.02/425.17
  6. Step 6: Final answer
    x = 536.51

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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.