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Finding the Fourth Proportional to 1,386.88, 2,077.88 and 1,236.22

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Solution

The fourth proportional to 1,386.88, 2,077.88 and 1,236.22 is: 1,852.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.88 : 2,077.88 = 1,236.22 : x
  2. Step 2: Convert to fraction form
    1,386.88/2,077.88 = 1,236.22/x
  3. Step 3: Cross multiply
    1,386.88x = 2,077.88 × 1,236.22
  4. Step 4: Simplify right side
    1,386.88x = 2,568,716.81
  5. Step 5: Solve for x
    x = 2,568,716.81/1,386.88
  6. Step 6: Final answer
    x = 1,852.16

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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.