Home / 1,321.03-1,981.50-455.95

Finding the Fourth Proportional to 1,321.03, 1,981.50 and 455.95

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Solution

The fourth proportional to 1,321.03, 1,981.50 and 455.95 is: 683.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.03 : 1,981.50 = 455.95 : x
  2. Step 2: Convert to fraction form
    1,321.03/1,981.50 = 455.95/x
  3. Step 3: Cross multiply
    1,321.03x = 1,981.50 × 455.95
  4. Step 4: Simplify right side
    1,321.03x = 903,464.93
  5. Step 5: Solve for x
    x = 903,464.93/1,321.03
  6. Step 6: Final answer
    x = 683.91

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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.