Home / 20,509.21-28,288.56-15,741.55

Finding the Fourth Proportional to 20,509.21, 28,288.56 and 15,741.55

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Solution

The fourth proportional to 20,509.21, 28,288.56 and 15,741.55 is: 21,712.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,509.21 : 28,288.56 = 15,741.55 : x
  2. Step 2: Convert to fraction form
    20,509.21/28,288.56 = 15,741.55/x
  3. Step 3: Cross multiply
    20,509.21x = 28,288.56 × 15,741.55
  4. Step 4: Simplify right side
    20,509.21x = 445,305,710.95
  5. Step 5: Solve for x
    x = 445,305,710.95/20,509.21
  6. Step 6: Final answer
    x = 21,712.48

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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.