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Finding the Fourth Proportional to 1,376.20, 2,064.46 and 682.75

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Solution

The fourth proportional to 1,376.20, 2,064.46 and 682.75 is: 1,024.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.20 : 2,064.46 = 682.75 : x
  2. Step 2: Convert to fraction form
    1,376.20/2,064.46 = 682.75/x
  3. Step 3: Cross multiply
    1,376.20x = 2,064.46 × 682.75
  4. Step 4: Simplify right side
    1,376.20x = 1,409,510.07
  5. Step 5: Solve for x
    x = 1,409,510.07/1,376.20
  6. Step 6: Final answer
    x = 1,024.20

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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.