Home / 209,065.88-313,603-66,938.28

Finding the Fourth Proportional to 209,065.88, 313,603 and 66,938.28

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Solution

The fourth proportional to 209,065.88, 313,603 and 66,938.28 is: 100,408.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,065.88 : 313,603 = 66,938.28 : x
  2. Step 2: Convert to fraction form
    209,065.88/313,603 = 66,938.28/x
  3. Step 3: Cross multiply
    209,065.88x = 313,603 × 66,938.28
  4. Step 4: Simplify right side
    209,065.88x = 20,992,045,422.84
  5. Step 5: Solve for x
    x = 20,992,045,422.84/209,065.88
  6. Step 6: Final answer
    x = 100,408.76

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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.