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Finding the Fourth Proportional to 680.57, 1,020.83 and 372.57

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Solution

The fourth proportional to 680.57, 1,020.83 and 372.57 is: 558.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.57 : 1,020.83 = 372.57 : x
  2. Step 2: Convert to fraction form
    680.57/1,020.83 = 372.57/x
  3. Step 3: Cross multiply
    680.57x = 1,020.83 × 372.57
  4. Step 4: Simplify right side
    680.57x = 380,330.63
  5. Step 5: Solve for x
    x = 380,330.63/680.57
  6. Step 6: Final answer
    x = 558.84

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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.