Home / 20,109.69-27,720.68-15,853.14

Finding the Fourth Proportional to 20,109.69, 27,720.68 and 15,853.14

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Solution

The fourth proportional to 20,109.69, 27,720.68 and 15,853.14 is: 21,853.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,109.69 : 27,720.68 = 15,853.14 : x
  2. Step 2: Convert to fraction form
    20,109.69/27,720.68 = 15,853.14/x
  3. Step 3: Cross multiply
    20,109.69x = 27,720.68 × 15,853.14
  4. Step 4: Simplify right side
    20,109.69x = 439,459,820.94
  5. Step 5: Solve for x
    x = 439,459,820.94/20,109.69
  6. Step 6: Final answer
    x = 21,853.14

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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.