Home / 1,290.26-1,942.28-1,111.64

Finding the Fourth Proportional to 1,290.26, 1,942.28 and 1,111.64

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Solution

The fourth proportional to 1,290.26, 1,942.28 and 1,111.64 is: 1,673.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.26 : 1,942.28 = 1,111.64 : x
  2. Step 2: Convert to fraction form
    1,290.26/1,942.28 = 1,111.64/x
  3. Step 3: Cross multiply
    1,290.26x = 1,942.28 × 1,111.64
  4. Step 4: Simplify right side
    1,290.26x = 2,159,116.14
  5. Step 5: Solve for x
    x = 2,159,116.14/1,290.26
  6. Step 6: Final answer
    x = 1,673.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.