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Finding the Fourth Proportional to 2,786.49, 4,179.69 and 678.14

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Solution

The fourth proportional to 2,786.49, 4,179.69 and 678.14 is: 1,017.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,786.49 : 4,179.69 = 678.14 : x
  2. Step 2: Convert to fraction form
    2,786.49/4,179.69 = 678.14/x
  3. Step 3: Cross multiply
    2,786.49x = 4,179.69 × 678.14
  4. Step 4: Simplify right side
    2,786.49x = 2,834,409.75
  5. Step 5: Solve for x
    x = 2,834,409.75/2,786.49
  6. Step 6: Final answer
    x = 1,017.20

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1.5x scale

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.