Home / 1,921.19-2,881.62-515.49

Finding the Fourth Proportional to 1,921.19, 2,881.62 and 515.49

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Solution

The fourth proportional to 1,921.19, 2,881.62 and 515.49 is: 773.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.19 : 2,881.62 = 515.49 : x
  2. Step 2: Convert to fraction form
    1,921.19/2,881.62 = 515.49/x
  3. Step 3: Cross multiply
    1,921.19x = 2,881.62 × 515.49
  4. Step 4: Simplify right side
    1,921.19x = 1,485,446.29
  5. Step 5: Solve for x
    x = 1,485,446.29/1,921.19
  6. Step 6: Final answer
    x = 773.19

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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.