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Finding the Fourth Proportional to 782.81, 1,174.29 and 205.69

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Solution

The fourth proportional to 782.81, 1,174.29 and 205.69 is: 308.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.81 : 1,174.29 = 205.69 : x
  2. Step 2: Convert to fraction form
    782.81/1,174.29 = 205.69/x
  3. Step 3: Cross multiply
    782.81x = 1,174.29 × 205.69
  4. Step 4: Simplify right side
    782.81x = 241,536.77
  5. Step 5: Solve for x
    x = 241,536.77/782.81
  6. Step 6: Final answer
    x = 308.55

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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.