Home / 1,921.08-2,651.22-1,223.40

Finding the Fourth Proportional to 1,921.08, 2,651.22 and 1,223.40

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Solution

The fourth proportional to 1,921.08, 2,651.22 and 1,223.40 is: 1,688.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.08 : 2,651.22 = 1,223.40 : x
  2. Step 2: Convert to fraction form
    1,921.08/2,651.22 = 1,223.40/x
  3. Step 3: Cross multiply
    1,921.08x = 2,651.22 × 1,223.40
  4. Step 4: Simplify right side
    1,921.08x = 3,243,502.55
  5. Step 5: Solve for x
    x = 3,243,502.55/1,921.08
  6. Step 6: Final answer
    x = 1,688.37

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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.