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Finding the Fourth Proportional to 1,240.19, 1,711.46 and 680.70

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Solution

The fourth proportional to 1,240.19, 1,711.46 and 680.70 is: 939.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.19 : 1,711.46 = 680.70 : x
  2. Step 2: Convert to fraction form
    1,240.19/1,711.46 = 680.70/x
  3. Step 3: Cross multiply
    1,240.19x = 1,711.46 × 680.70
  4. Step 4: Simplify right side
    1,240.19x = 1,164,987.42
  5. Step 5: Solve for x
    x = 1,164,987.42/1,240.19
  6. Step 6: Final answer
    x = 939.37

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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.