Home / 13,748.56-18,972.75-7,780.12

Finding the Fourth Proportional to 13,748.56, 18,972.75 and 7,780.12

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Solution

The fourth proportional to 13,748.56, 18,972.75 and 7,780.12 is: 10,736.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,748.56 : 18,972.75 = 7,780.12 : x
  2. Step 2: Convert to fraction form
    13,748.56/18,972.75 = 7,780.12/x
  3. Step 3: Cross multiply
    13,748.56x = 18,972.75 × 7,780.12
  4. Step 4: Simplify right side
    13,748.56x = 147,610,271.73
  5. Step 5: Solve for x
    x = 147,610,271.73/13,748.56
  6. Step 6: Final answer
    x = 10,736.42

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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.