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Finding the Fourth Proportional to 1,138.15, 1,568.77 and 764.94

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Solution

The fourth proportional to 1,138.15, 1,568.77 and 764.94 is: 1,054.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.15 : 1,568.77 = 764.94 : x
  2. Step 2: Convert to fraction form
    1,138.15/1,568.77 = 764.94/x
  3. Step 3: Cross multiply
    1,138.15x = 1,568.77 × 764.94
  4. Step 4: Simplify right side
    1,138.15x = 1,200,018.89
  5. Step 5: Solve for x
    x = 1,200,018.89/1,138.15
  6. Step 6: Final answer
    x = 1,054.36

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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.