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Finding the Fourth Proportional to 680.74, 1,021.14 and 372.76

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Solution

The fourth proportional to 680.74, 1,021.14 and 372.76 is: 559.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.74 : 1,021.14 = 372.76 : x
  2. Step 2: Convert to fraction form
    680.74/1,021.14 = 372.76/x
  3. Step 3: Cross multiply
    680.74x = 1,021.14 × 372.76
  4. Step 4: Simplify right side
    680.74x = 380,640.15
  5. Step 5: Solve for x
    x = 380,640.15/680.74
  6. Step 6: Final answer
    x = 559.16

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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.