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Finding the Fourth Proportional to 1,981.70, 2,972.63 and 683.17

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Solution

The fourth proportional to 1,981.70, 2,972.63 and 683.17 is: 1,024.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.70 : 2,972.63 = 683.17 : x
  2. Step 2: Convert to fraction form
    1,981.70/2,972.63 = 683.17/x
  3. Step 3: Cross multiply
    1,981.70x = 2,972.63 × 683.17
  4. Step 4: Simplify right side
    1,981.70x = 2,030,811.64
  5. Step 5: Solve for x
    x = 2,030,811.64/1,981.70
  6. Step 6: Final answer
    x = 1,024.78

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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.