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Finding the Fourth Proportional to 1,387.77, 1,905.09 and 1,190.94

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Solution

The fourth proportional to 1,387.77, 1,905.09 and 1,190.94 is: 1,634.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.77 : 1,905.09 = 1,190.94 : x
  2. Step 2: Convert to fraction form
    1,387.77/1,905.09 = 1,190.94/x
  3. Step 3: Cross multiply
    1,387.77x = 1,905.09 × 1,190.94
  4. Step 4: Simplify right side
    1,387.77x = 2,268,847.88
  5. Step 5: Solve for x
    x = 2,268,847.88/1,387.77
  6. Step 6: Final answer
    x = 1,634.89

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.