Home / 1,290.92-1,782.15-1,091.66

Finding the Fourth Proportional to 1,290.92, 1,782.15 and 1,091.66

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Solution

The fourth proportional to 1,290.92, 1,782.15 and 1,091.66 is: 1,507.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.92 : 1,782.15 = 1,091.66 : x
  2. Step 2: Convert to fraction form
    1,290.92/1,782.15 = 1,091.66/x
  3. Step 3: Cross multiply
    1,290.92x = 1,782.15 × 1,091.66
  4. Step 4: Simplify right side
    1,290.92x = 1,945,501.87
  5. Step 5: Solve for x
    x = 1,945,501.87/1,290.92
  6. Step 6: Final answer
    x = 1,507.07

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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.