Home / 1,412.25-2,118.39-386.25

Finding the Fourth Proportional to 1,412.25, 2,118.39 and 386.25

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Solution

The fourth proportional to 1,412.25, 2,118.39 and 386.25 is: 579.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.25 : 2,118.39 = 386.25 : x
  2. Step 2: Convert to fraction form
    1,412.25/2,118.39 = 386.25/x
  3. Step 3: Cross multiply
    1,412.25x = 2,118.39 × 386.25
  4. Step 4: Simplify right side
    1,412.25x = 818,228.14
  5. Step 5: Solve for x
    x = 818,228.14/1,412.25
  6. Step 6: Final answer
    x = 579.38

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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.