Home / 1,321.46-1,981.50-455.57

Finding the Fourth Proportional to 1,321.46, 1,981.50 and 455.57

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Solution

The fourth proportional to 1,321.46, 1,981.50 and 455.57 is: 683.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.46 : 1,981.50 = 455.57 : x
  2. Step 2: Convert to fraction form
    1,321.46/1,981.50 = 455.57/x
  3. Step 3: Cross multiply
    1,321.46x = 1,981.50 × 455.57
  4. Step 4: Simplify right side
    1,321.46x = 902,711.96
  5. Step 5: Solve for x
    x = 902,711.96/1,321.46
  6. Step 6: Final answer
    x = 683.12

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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.