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Finding the Fourth Proportional to 2,786.40, 4,154.40 and 2,642.40

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Solution

The fourth proportional to 2,786.40, 4,154.40 and 2,642.40 is: 3,939.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,786.40 : 4,154.40 = 2,642.40 : x
  2. Step 2: Convert to fraction form
    2,786.40/4,154.40 = 2,642.40/x
  3. Step 3: Cross multiply
    2,786.40x = 4,154.40 × 2,642.40
  4. Step 4: Simplify right side
    2,786.40x = 10,977,586.56
  5. Step 5: Solve for x
    x = 10,977,586.56/2,786.40
  6. Step 6: Final answer
    x = 3,939.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.