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Finding the Fourth Proportional to 2,085.44, 3,128.60 and 786.88

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Solution

The fourth proportional to 2,085.44, 3,128.60 and 786.88 is: 1,180.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.44 : 3,128.60 = 786.88 : x
  2. Step 2: Convert to fraction form
    2,085.44/3,128.60 = 786.88/x
  3. Step 3: Cross multiply
    2,085.44x = 3,128.60 × 786.88
  4. Step 4: Simplify right side
    2,085.44x = 2,461,832.77
  5. Step 5: Solve for x
    x = 2,461,832.77/2,085.44
  6. Step 6: Final answer
    x = 1,180.49

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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.