Home / 1,916.82-2,646.22-1,290.64

Finding the Fourth Proportional to 1,916.82, 2,646.22 and 1,290.64

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Solution

The fourth proportional to 1,916.82, 2,646.22 and 1,290.64 is: 1,781.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.82 : 2,646.22 = 1,290.64 : x
  2. Step 2: Convert to fraction form
    1,916.82/2,646.22 = 1,290.64/x
  3. Step 3: Cross multiply
    1,916.82x = 2,646.22 × 1,290.64
  4. Step 4: Simplify right side
    1,916.82x = 3,415,317.38
  5. Step 5: Solve for x
    x = 3,415,317.38/1,916.82
  6. Step 6: Final answer
    x = 1,781.76

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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.