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Finding the Fourth Proportional to 564.86, 778.59 and 398.81

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Solution

The fourth proportional to 564.86, 778.59 and 398.81 is: 549.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.86 : 778.59 = 398.81 : x
  2. Step 2: Convert to fraction form
    564.86/778.59 = 398.81/x
  3. Step 3: Cross multiply
    564.86x = 778.59 × 398.81
  4. Step 4: Simplify right side
    564.86x = 310,505.58
  5. Step 5: Solve for x
    x = 310,505.58/564.86
  6. Step 6: Final answer
    x = 549.71

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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.