Home / 1,279.95-1,921.79-1,119.57

Finding the Fourth Proportional to 1,279.95, 1,921.79 and 1,119.57

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Solution

The fourth proportional to 1,279.95, 1,921.79 and 1,119.57 is: 1,680.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.95 : 1,921.79 = 1,119.57 : x
  2. Step 2: Convert to fraction form
    1,279.95/1,921.79 = 1,119.57/x
  3. Step 3: Cross multiply
    1,279.95x = 1,921.79 × 1,119.57
  4. Step 4: Simplify right side
    1,279.95x = 2,151,574.02
  5. Step 5: Solve for x
    x = 2,151,574.02/1,279.95
  6. Step 6: Final answer
    x = 1,680.99

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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.