Home / 1,021.27-1,409.39-623.20

Finding the Fourth Proportional to 1,021.27, 1,409.39 and 623.20

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Solution

The fourth proportional to 1,021.27, 1,409.39 and 623.20 is: 860.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.27 : 1,409.39 = 623.20 : x
  2. Step 2: Convert to fraction form
    1,021.27/1,409.39 = 623.20/x
  3. Step 3: Cross multiply
    1,021.27x = 1,409.39 × 623.20
  4. Step 4: Simplify right side
    1,021.27x = 878,331.85
  5. Step 5: Solve for x
    x = 878,331.85/1,021.27
  6. Step 6: Final answer
    x = 860.04

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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.