Home / 13,748.85-18,974.96-7,780.90

Finding the Fourth Proportional to 13,748.85, 18,974.96 and 7,780.90

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Solution

The fourth proportional to 13,748.85, 18,974.96 and 7,780.90 is: 10,738.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,748.85 : 18,974.96 = 7,780.90 : x
  2. Step 2: Convert to fraction form
    13,748.85/18,974.96 = 7,780.90/x
  3. Step 3: Cross multiply
    13,748.85x = 18,974.96 × 7,780.90
  4. Step 4: Simplify right side
    13,748.85x = 147,642,274.80
  5. Step 5: Solve for x
    x = 147,642,274.80/13,748.85
  6. Step 6: Final answer
    x = 10,738.52

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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.