Home / 1,415.36-2,120.64-865.92

Finding the Fourth Proportional to 1,415.36, 2,120.64 and 865.92

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Solution

The fourth proportional to 1,415.36, 2,120.64 and 865.92 is: 1,297.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.36 : 2,120.64 = 865.92 : x
  2. Step 2: Convert to fraction form
    1,415.36/2,120.64 = 865.92/x
  3. Step 3: Cross multiply
    1,415.36x = 2,120.64 × 865.92
  4. Step 4: Simplify right side
    1,415.36x = 1,836,304.59
  5. Step 5: Solve for x
    x = 1,836,304.59/1,415.36
  6. Step 6: Final answer
    x = 1,297.41

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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.