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Finding the Fourth Proportional to 2,140.96, 3,211.86 and 908.36

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Solution

The fourth proportional to 2,140.96, 3,211.86 and 908.36 is: 1,362.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.96 : 3,211.86 = 908.36 : x
  2. Step 2: Convert to fraction form
    2,140.96/3,211.86 = 908.36/x
  3. Step 3: Cross multiply
    2,140.96x = 3,211.86 × 908.36
  4. Step 4: Simplify right side
    2,140.96x = 2,917,525.15
  5. Step 5: Solve for x
    x = 2,917,525.15/2,140.96
  6. Step 6: Final answer
    x = 1,362.72

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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.