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Finding the Fourth Proportional to 1,388.34, 2,080.22 and 694.31

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Solution

The fourth proportional to 1,388.34, 2,080.22 and 694.31 is: 1,040.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.34 : 2,080.22 = 694.31 : x
  2. Step 2: Convert to fraction form
    1,388.34/2,080.22 = 694.31/x
  3. Step 3: Cross multiply
    1,388.34x = 2,080.22 × 694.31
  4. Step 4: Simplify right side
    1,388.34x = 1,444,303.68
  5. Step 5: Solve for x
    x = 1,444,303.68/1,388.34
  6. Step 6: Final answer
    x = 1,040.31

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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.