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Finding the Fourth Proportional to 563.18, 777.15 and 311.09

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Solution

The fourth proportional to 563.18, 777.15 and 311.09 is: 429.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.18 : 777.15 = 311.09 : x
  2. Step 2: Convert to fraction form
    563.18/777.15 = 311.09/x
  3. Step 3: Cross multiply
    563.18x = 777.15 × 311.09
  4. Step 4: Simplify right side
    563.18x = 241,759.71
  5. Step 5: Solve for x
    x = 241,759.71/563.18
  6. Step 6: Final answer
    x = 429.28

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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.