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Finding the Fourth Proportional to 851.09, 1,277.07 and 388.81

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Solution

The fourth proportional to 851.09, 1,277.07 and 388.81 is: 583.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.09 : 1,277.07 = 388.81 : x
  2. Step 2: Convert to fraction form
    851.09/1,277.07 = 388.81/x
  3. Step 3: Cross multiply
    851.09x = 1,277.07 × 388.81
  4. Step 4: Simplify right side
    851.09x = 496,537.59
  5. Step 5: Solve for x
    x = 496,537.59/851.09
  6. Step 6: Final answer
    x = 583.41

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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.