Home / 20,389.56-28,138.88-11,437.64

Finding the Fourth Proportional to 20,389.56, 28,138.88 and 11,437.64

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Solution

The fourth proportional to 20,389.56, 28,138.88 and 11,437.64 is: 15,784.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.56 : 28,138.88 = 11,437.64 : x
  2. Step 2: Convert to fraction form
    20,389.56/28,138.88 = 11,437.64/x
  3. Step 3: Cross multiply
    20,389.56x = 28,138.88 × 11,437.64
  4. Step 4: Simplify right side
    20,389.56x = 321,842,379.44
  5. Step 5: Solve for x
    x = 321,842,379.44/20,389.56
  6. Step 6: Final answer
    x = 15,784.67

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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.