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Finding the Fourth Proportional to 1,245.75, 1,866.20 and 627.63

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Solution

The fourth proportional to 1,245.75, 1,866.20 and 627.63 is: 940.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.75 : 1,866.20 = 627.63 : x
  2. Step 2: Convert to fraction form
    1,245.75/1,866.20 = 627.63/x
  3. Step 3: Cross multiply
    1,245.75x = 1,866.20 × 627.63
  4. Step 4: Simplify right side
    1,245.75x = 1,171,279.97
  5. Step 5: Solve for x
    x = 1,171,279.97/1,245.75
  6. Step 6: Final answer
    x = 940.22

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1.5x scale

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.