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Finding the Fourth Proportional to 1,240.21, 1,711.42 and 680.67

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Solution

The fourth proportional to 1,240.21, 1,711.42 and 680.67 is: 939.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.21 : 1,711.42 = 680.67 : x
  2. Step 2: Convert to fraction form
    1,240.21/1,711.42 = 680.67/x
  3. Step 3: Cross multiply
    1,240.21x = 1,711.42 × 680.67
  4. Step 4: Simplify right side
    1,240.21x = 1,164,912.25
  5. Step 5: Solve for x
    x = 1,164,912.25/1,240.21
  6. Step 6: Final answer
    x = 939.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.