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Finding the Fourth Proportional to 1,261.09, 1,891.80 and 383.49

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Solution

The fourth proportional to 1,261.09, 1,891.80 and 383.49 is: 575.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.09 : 1,891.80 = 383.49 : x
  2. Step 2: Convert to fraction form
    1,261.09/1,891.80 = 383.49/x
  3. Step 3: Cross multiply
    1,261.09x = 1,891.80 × 383.49
  4. Step 4: Simplify right side
    1,261.09x = 725,486.38
  5. Step 5: Solve for x
    x = 725,486.38/1,261.09
  6. Step 6: Final answer
    x = 575.29

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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.