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Finding the Fourth Proportional to 564.60, 779.64 and 399.12

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Solution

The fourth proportional to 564.60, 779.64 and 399.12 is: 551.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.60 : 779.64 = 399.12 : x
  2. Step 2: Convert to fraction form
    564.60/779.64 = 399.12/x
  3. Step 3: Cross multiply
    564.60x = 779.64 × 399.12
  4. Step 4: Simplify right side
    564.60x = 311,169.92
  5. Step 5: Solve for x
    x = 311,169.92/564.60
  6. Step 6: Final answer
    x = 551.13

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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.