Home / 1,278.43-1,916.28-661.97

Finding the Fourth Proportional to 1,278.43, 1,916.28 and 661.97

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Solution

The fourth proportional to 1,278.43, 1,916.28 and 661.97 is: 992.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.43 : 1,916.28 = 661.97 : x
  2. Step 2: Convert to fraction form
    1,278.43/1,916.28 = 661.97/x
  3. Step 3: Cross multiply
    1,278.43x = 1,916.28 × 661.97
  4. Step 4: Simplify right side
    1,278.43x = 1,268,519.87
  5. Step 5: Solve for x
    x = 1,268,519.87/1,278.43
  6. Step 6: Final answer
    x = 992.25

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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.