Home / 1,392.27-1,921.91-1,021.90

Finding the Fourth Proportional to 1,392.27, 1,921.91 and 1,021.90

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Solution

The fourth proportional to 1,392.27, 1,921.91 and 1,021.90 is: 1,410.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.27 : 1,921.91 = 1,021.90 : x
  2. Step 2: Convert to fraction form
    1,392.27/1,921.91 = 1,021.90/x
  3. Step 3: Cross multiply
    1,392.27x = 1,921.91 × 1,021.90
  4. Step 4: Simplify right side
    1,392.27x = 1,963,989.91
  5. Step 5: Solve for x
    x = 1,963,989.91/1,392.27
  6. Step 6: Final answer
    x = 1,410.64

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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.