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Finding the Fourth Proportional to 1,206.74, 1,810.56 and 426.80

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Solution

The fourth proportional to 1,206.74, 1,810.56 and 426.80 is: 640.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.74 : 1,810.56 = 426.80 : x
  2. Step 2: Convert to fraction form
    1,206.74/1,810.56 = 426.80/x
  3. Step 3: Cross multiply
    1,206.74x = 1,810.56 × 426.80
  4. Step 4: Simplify right side
    1,206.74x = 772,747.01
  5. Step 5: Solve for x
    x = 772,747.01/1,206.74
  6. Step 6: Final answer
    x = 640.36

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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.