Home / 1,639.12-2,261.36-940.16

Finding the Fourth Proportional to 1,639.12, 2,261.36 and 940.16

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Solution

The fourth proportional to 1,639.12, 2,261.36 and 940.16 is: 1,297.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.12 : 2,261.36 = 940.16 : x
  2. Step 2: Convert to fraction form
    1,639.12/2,261.36 = 940.16/x
  3. Step 3: Cross multiply
    1,639.12x = 2,261.36 × 940.16
  4. Step 4: Simplify right side
    1,639.12x = 2,126,040.22
  5. Step 5: Solve for x
    x = 2,126,040.22/1,639.12
  6. Step 6: Final answer
    x = 1,297.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.