Home / 13,720.14-18,939.69-9,894.78

Finding the Fourth Proportional to 13,720.14, 18,939.69 and 9,894.78

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Solution

The fourth proportional to 13,720.14, 18,939.69 and 9,894.78 is: 13,659.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.14 : 18,939.69 = 9,894.78 : x
  2. Step 2: Convert to fraction form
    13,720.14/18,939.69 = 9,894.78/x
  3. Step 3: Cross multiply
    13,720.14x = 18,939.69 × 9,894.78
  4. Step 4: Simplify right side
    13,720.14x = 187,404,065.82
  5. Step 5: Solve for x
    x = 187,404,065.82/13,720.14
  6. Step 6: Final answer
    x = 13,659.05

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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.