Home / 20,511.21-28,291.32-15,743.55

Finding the Fourth Proportional to 20,511.21, 28,291.32 and 15,743.55

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Solution

The fourth proportional to 20,511.21, 28,291.32 and 15,743.55 is: 21,715.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,511.21 : 28,291.32 = 15,743.55 : x
  2. Step 2: Convert to fraction form
    20,511.21/28,291.32 = 15,743.55/x
  3. Step 3: Cross multiply
    20,511.21x = 28,291.32 × 15,743.55
  4. Step 4: Simplify right side
    20,511.21x = 445,405,810.99
  5. Step 5: Solve for x
    x = 445,405,810.99/20,511.21
  6. Step 6: Final answer
    x = 21,715.24

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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.