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Finding the Fourth Proportional to 1,991.20, 2,987.16 and 895.60

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Solution

The fourth proportional to 1,991.20, 2,987.16 and 895.60 is: 1,343.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.20 : 2,987.16 = 895.60 : x
  2. Step 2: Convert to fraction form
    1,991.20/2,987.16 = 895.60/x
  3. Step 3: Cross multiply
    1,991.20x = 2,987.16 × 895.60
  4. Step 4: Simplify right side
    1,991.20x = 2,675,300.50
  5. Step 5: Solve for x
    x = 2,675,300.50/1,991.20
  6. Step 6: Final answer
    x = 1,343.56

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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.