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Finding the Fourth Proportional to 608.86, 840.61 and 399.34

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Solution

The fourth proportional to 608.86, 840.61 and 399.34 is: 551.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.86 : 840.61 = 399.34 : x
  2. Step 2: Convert to fraction form
    608.86/840.61 = 399.34/x
  3. Step 3: Cross multiply
    608.86x = 840.61 × 399.34
  4. Step 4: Simplify right side
    608.86x = 335,690.75
  5. Step 5: Solve for x
    x = 335,690.75/608.86
  6. Step 6: Final answer
    x = 551.34

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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.