Home / 1,988.70-2,745.75-1,778.22

Finding the Fourth Proportional to 1,988.70, 2,745.75 and 1,778.22

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Solution

The fourth proportional to 1,988.70, 2,745.75 and 1,778.22 is: 2,455.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.70 : 2,745.75 = 1,778.22 : x
  2. Step 2: Convert to fraction form
    1,988.70/2,745.75 = 1,778.22/x
  3. Step 3: Cross multiply
    1,988.70x = 2,745.75 × 1,778.22
  4. Step 4: Simplify right side
    1,988.70x = 4,882,547.57
  5. Step 5: Solve for x
    x = 4,882,547.57/1,988.70
  6. Step 6: Final answer
    x = 2,455.15

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1.5x scale

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.