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Finding the Fourth Proportional to 563.21, 777.27 and 388.25

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Solution

The fourth proportional to 563.21, 777.27 and 388.25 is: 535.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.21 : 777.27 = 388.25 : x
  2. Step 2: Convert to fraction form
    563.21/777.27 = 388.25/x
  3. Step 3: Cross multiply
    563.21x = 777.27 × 388.25
  4. Step 4: Simplify right side
    563.21x = 301,775.08
  5. Step 5: Solve for x
    x = 301,775.08/563.21
  6. Step 6: Final answer
    x = 535.81

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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.