Home / 1,921.21-2,881.81-1,098.90

Finding the Fourth Proportional to 1,921.21, 2,881.81 and 1,098.90

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Solution

The fourth proportional to 1,921.21, 2,881.81 and 1,098.90 is: 1,648.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.21 : 2,881.81 = 1,098.90 : x
  2. Step 2: Convert to fraction form
    1,921.21/2,881.81 = 1,098.90/x
  3. Step 3: Cross multiply
    1,921.21x = 2,881.81 × 1,098.90
  4. Step 4: Simplify right side
    1,921.21x = 3,166,821.01
  5. Step 5: Solve for x
    x = 3,166,821.01/1,921.21
  6. Step 6: Final answer
    x = 1,648.35

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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.