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Finding the Fourth Proportional to 2,140.67, 3,211.50 and 908.13

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Solution

The fourth proportional to 2,140.67, 3,211.50 and 908.13 is: 1,362.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.67 : 3,211.50 = 908.13 : x
  2. Step 2: Convert to fraction form
    2,140.67/3,211.50 = 908.13/x
  3. Step 3: Cross multiply
    2,140.67x = 3,211.50 × 908.13
  4. Step 4: Simplify right side
    2,140.67x = 2,916,459.50
  5. Step 5: Solve for x
    x = 2,916,459.50/2,140.67
  6. Step 6: Final answer
    x = 1,362.40

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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.