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Finding the Fourth Proportional to 563.81, 778.34 and 388.85

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Solution

The fourth proportional to 563.81, 778.34 and 388.85 is: 536.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.81 : 778.34 = 388.85 : x
  2. Step 2: Convert to fraction form
    563.81/778.34 = 388.85/x
  3. Step 3: Cross multiply
    563.81x = 778.34 × 388.85
  4. Step 4: Simplify right side
    563.81x = 302,654.59
  5. Step 5: Solve for x
    x = 302,654.59/563.81
  6. Step 6: Final answer
    x = 536.81

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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.