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Finding the Fourth Proportional to 563.28, 776.58 and 405.78

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Solution

The fourth proportional to 563.28, 776.58 and 405.78 is: 559.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.28 : 776.58 = 405.78 : x
  2. Step 2: Convert to fraction form
    563.28/776.58 = 405.78/x
  3. Step 3: Cross multiply
    563.28x = 776.58 × 405.78
  4. Step 4: Simplify right side
    563.28x = 315,120.63
  5. Step 5: Solve for x
    x = 315,120.63/563.28
  6. Step 6: Final answer
    x = 559.44

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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.