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Finding the Fourth Proportional to 1,921.19, 2,879.49 and 749.79

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Solution

The fourth proportional to 1,921.19, 2,879.49 and 749.79 is: 1,123.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.19 : 2,879.49 = 749.79 : x
  2. Step 2: Convert to fraction form
    1,921.19/2,879.49 = 749.79/x
  3. Step 3: Cross multiply
    1,921.19x = 2,879.49 × 749.79
  4. Step 4: Simplify right side
    1,921.19x = 2,159,012.81
  5. Step 5: Solve for x
    x = 2,159,012.81/1,921.19
  6. Step 6: Final answer
    x = 1,123.79

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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.