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Finding the Fourth Proportional to 1,288.51, 1,779.03 and 791.71

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Solution

The fourth proportional to 1,288.51, 1,779.03 and 791.71 is: 1,093.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.51 : 1,779.03 = 791.71 : x
  2. Step 2: Convert to fraction form
    1,288.51/1,779.03 = 791.71/x
  3. Step 3: Cross multiply
    1,288.51x = 1,779.03 × 791.71
  4. Step 4: Simplify right side
    1,288.51x = 1,408,471.39
  5. Step 5: Solve for x
    x = 1,408,471.39/1,288.51
  6. Step 6: Final answer
    x = 1,093.10

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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.