Home / 1,420.36-2,133.78-1,112.68

Finding the Fourth Proportional to 1,420.36, 2,133.78 and 1,112.68

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Solution

The fourth proportional to 1,420.36, 2,133.78 and 1,112.68 is: 1,671.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.36 : 2,133.78 = 1,112.68 : x
  2. Step 2: Convert to fraction form
    1,420.36/2,133.78 = 1,112.68/x
  3. Step 3: Cross multiply
    1,420.36x = 2,133.78 × 1,112.68
  4. Step 4: Simplify right side
    1,420.36x = 2,374,214.33
  5. Step 5: Solve for x
    x = 2,374,214.33/1,420.36
  6. Step 6: Final answer
    x = 1,671.56

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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.