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Finding the Fourth Proportional to 2,690.70, 3,713.22 and 1,511.85

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Solution

The fourth proportional to 2,690.70, 3,713.22 and 1,511.85 is: 2,086.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690.70 : 3,713.22 = 1,511.85 : x
  2. Step 2: Convert to fraction form
    2,690.70/3,713.22 = 1,511.85/x
  3. Step 3: Cross multiply
    2,690.70x = 3,713.22 × 1,511.85
  4. Step 4: Simplify right side
    2,690.70x = 5,613,831.66
  5. Step 5: Solve for x
    x = 5,613,831.66/2,690.70
  6. Step 6: Final answer
    x = 2,086.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.