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Finding the Fourth Proportional to 2,907.87, 4,361.76 and 1,981.12

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Solution

The fourth proportional to 2,907.87, 4,361.76 and 1,981.12 is: 2,971.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,907.87 : 4,361.76 = 1,981.12 : x
  2. Step 2: Convert to fraction form
    2,907.87/4,361.76 = 1,981.12/x
  3. Step 3: Cross multiply
    2,907.87x = 4,361.76 × 1,981.12
  4. Step 4: Simplify right side
    2,907.87x = 8,641,169.97
  5. Step 5: Solve for x
    x = 8,641,169.97/2,907.87
  6. Step 6: Final answer
    x = 2,971.65

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Double scale
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Similar ratio
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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.