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Finding the Fourth Proportional to 1,137.75, 1,569.49 and 764.09

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Solution

The fourth proportional to 1,137.75, 1,569.49 and 764.09 is: 1,054.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.75 : 1,569.49 = 764.09 : x
  2. Step 2: Convert to fraction form
    1,137.75/1,569.49 = 764.09/x
  3. Step 3: Cross multiply
    1,137.75x = 1,569.49 × 764.09
  4. Step 4: Simplify right side
    1,137.75x = 1,199,221.86
  5. Step 5: Solve for x
    x = 1,199,221.86/1,137.75
  6. Step 6: Final answer
    x = 1,054.03

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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.