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Finding the Fourth Proportional to 564.84, 778.56 and 398.68

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Solution

The fourth proportional to 564.84, 778.56 and 398.68 is: 549.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.84 : 778.56 = 398.68 : x
  2. Step 2: Convert to fraction form
    564.84/778.56 = 398.68/x
  3. Step 3: Cross multiply
    564.84x = 778.56 × 398.68
  4. Step 4: Simplify right side
    564.84x = 310,396.30
  5. Step 5: Solve for x
    x = 310,396.30/564.84
  6. Step 6: Final answer
    x = 549.53

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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.