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Finding the Fourth Proportional to 680.72, 1,020.95 and 193.64

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Solution

The fourth proportional to 680.72, 1,020.95 and 193.64 is: 290.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.72 : 1,020.95 = 193.64 : x
  2. Step 2: Convert to fraction form
    680.72/1,020.95 = 193.64/x
  3. Step 3: Cross multiply
    680.72x = 1,020.95 × 193.64
  4. Step 4: Simplify right side
    680.72x = 197,695.79
  5. Step 5: Solve for x
    x = 197,695.79/680.72
  6. Step 6: Final answer
    x = 290.42

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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.