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Finding the Fourth Proportional to 561.98, 842.02 and 398.86

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Solution

The fourth proportional to 561.98, 842.02 and 398.86 is: 597.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.98 : 842.02 = 398.86 : x
  2. Step 2: Convert to fraction form
    561.98/842.02 = 398.86/x
  3. Step 3: Cross multiply
    561.98x = 842.02 × 398.86
  4. Step 4: Simplify right side
    561.98x = 335,848.10
  5. Step 5: Solve for x
    x = 335,848.10/561.98
  6. Step 6: Final answer
    x = 597.62

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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.