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Finding the Fourth Proportional to 2,078.80, 3,118.79 and 693.04

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Solution

The fourth proportional to 2,078.80, 3,118.79 and 693.04 is: 1,039.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,078.80 : 3,118.79 = 693.04 : x
  2. Step 2: Convert to fraction form
    2,078.80/3,118.79 = 693.04/x
  3. Step 3: Cross multiply
    2,078.80x = 3,118.79 × 693.04
  4. Step 4: Simplify right side
    2,078.80x = 2,161,442.11
  5. Step 5: Solve for x
    x = 2,161,442.11/2,078.80
  6. Step 6: Final answer
    x = 1,039.76

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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.