Home / 1,321.09-1,981.95-455.41

Finding the Fourth Proportional to 1,321.09, 1,981.95 and 455.41

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Solution

The fourth proportional to 1,321.09, 1,981.95 and 455.41 is: 683.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.09 : 1,981.95 = 455.41 : x
  2. Step 2: Convert to fraction form
    1,321.09/1,981.95 = 455.41/x
  3. Step 3: Cross multiply
    1,321.09x = 1,981.95 × 455.41
  4. Step 4: Simplify right side
    1,321.09x = 902,599.85
  5. Step 5: Solve for x
    x = 902,599.85/1,321.09
  6. Step 6: Final answer
    x = 683.22

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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.