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Finding the Fourth Proportional to 2,140.80, 3,211.65 and 908.79

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Solution

The fourth proportional to 2,140.80, 3,211.65 and 908.79 is: 1,363.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.80 : 3,211.65 = 908.79 : x
  2. Step 2: Convert to fraction form
    2,140.80/3,211.65 = 908.79/x
  3. Step 3: Cross multiply
    2,140.80x = 3,211.65 × 908.79
  4. Step 4: Simplify right side
    2,140.80x = 2,918,715.40
  5. Step 5: Solve for x
    x = 2,918,715.40/2,140.80
  6. Step 6: Final answer
    x = 1,363.38

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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.