Home / 20,739.78-28,621.08-11,308.41

Finding the Fourth Proportional to 20,739.78, 28,621.08 and 11,308.41

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Solution

The fourth proportional to 20,739.78, 28,621.08 and 11,308.41 is: 15,605.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.78 : 28,621.08 = 11,308.41 : x
  2. Step 2: Convert to fraction form
    20,739.78/28,621.08 = 11,308.41/x
  3. Step 3: Cross multiply
    20,739.78x = 28,621.08 × 11,308.41
  4. Step 4: Simplify right side
    20,739.78x = 323,658,907.28
  5. Step 5: Solve for x
    x = 323,658,907.28/20,739.78
  6. Step 6: Final answer
    x = 15,605.71

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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.