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Finding the Fourth Proportional to 608.20, 838.98 and 421.88

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Solution

The fourth proportional to 608.20, 838.98 and 421.88 is: 581.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.20 : 838.98 = 421.88 : x
  2. Step 2: Convert to fraction form
    608.20/838.98 = 421.88/x
  3. Step 3: Cross multiply
    608.20x = 838.98 × 421.88
  4. Step 4: Simplify right side
    608.20x = 353,948.88
  5. Step 5: Solve for x
    x = 353,948.88/608.20
  6. Step 6: Final answer
    x = 581.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.