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Finding the Fourth Proportional to 771.25, 1,156.84 and 223.42

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Solution

The fourth proportional to 771.25, 1,156.84 and 223.42 is: 335.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.25 : 1,156.84 = 223.42 : x
  2. Step 2: Convert to fraction form
    771.25/1,156.84 = 223.42/x
  3. Step 3: Cross multiply
    771.25x = 1,156.84 × 223.42
  4. Step 4: Simplify right side
    771.25x = 258,461.19
  5. Step 5: Solve for x
    x = 258,461.19/771.25
  6. Step 6: Final answer
    x = 335.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.