Home / 20,129.55-27,782.72-12,856.97

Finding the Fourth Proportional to 20,129.55, 27,782.72 and 12,856.97

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Solution

The fourth proportional to 20,129.55, 27,782.72 and 12,856.97 is: 17,745.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.55 : 27,782.72 = 12,856.97 : x
  2. Step 2: Convert to fraction form
    20,129.55/27,782.72 = 12,856.97/x
  3. Step 3: Cross multiply
    20,129.55x = 27,782.72 × 12,856.97
  4. Step 4: Simplify right side
    20,129.55x = 357,201,394.36
  5. Step 5: Solve for x
    x = 357,201,394.36/20,129.55
  6. Step 6: Final answer
    x = 17,745.13

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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.