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Finding the Fourth Proportional to 2,140.98, 3,211.20 and 908.88

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Solution

The fourth proportional to 2,140.98, 3,211.20 and 908.88 is: 1,363.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.98 : 3,211.20 = 908.88 : x
  2. Step 2: Convert to fraction form
    2,140.98/3,211.20 = 908.88/x
  3. Step 3: Cross multiply
    2,140.98x = 3,211.20 × 908.88
  4. Step 4: Simplify right side
    2,140.98x = 2,918,595.46
  5. Step 5: Solve for x
    x = 2,918,595.46/2,140.98
  6. Step 6: Final answer
    x = 1,363.21

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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.