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Finding the Fourth Proportional to 782.81, 1,174.23 and 205.70

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Solution

The fourth proportional to 782.81, 1,174.23 and 205.70 is: 308.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.81 : 1,174.23 = 205.70 : x
  2. Step 2: Convert to fraction form
    782.81/1,174.23 = 205.70/x
  3. Step 3: Cross multiply
    782.81x = 1,174.23 × 205.70
  4. Step 4: Simplify right side
    782.81x = 241,533.24
  5. Step 5: Solve for x
    x = 241,533.24/782.81
  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.