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Finding the Fourth Proportional to 564.80, 779.20 and 378.40

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Solution

The fourth proportional to 564.80, 779.20 and 378.40 is: 522.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.80 : 779.20 = 378.40 : x
  2. Step 2: Convert to fraction form
    564.80/779.20 = 378.40/x
  3. Step 3: Cross multiply
    564.80x = 779.20 × 378.40
  4. Step 4: Simplify right side
    564.80x = 294,849.28
  5. Step 5: Solve for x
    x = 294,849.28/564.80
  6. Step 6: Final answer
    x = 522.04

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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.