Home / 20,389.81-28,137.78-11,437.29

Finding the Fourth Proportional to 20,389.81, 28,137.78 and 11,437.29

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Solution

The fourth proportional to 20,389.81, 28,137.78 and 11,437.29 is: 15,783.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.81 : 28,137.78 = 11,437.29 : x
  2. Step 2: Convert to fraction form
    20,389.81/28,137.78 = 11,437.29/x
  3. Step 3: Cross multiply
    20,389.81x = 28,137.78 × 11,437.29
  4. Step 4: Simplify right side
    20,389.81x = 321,819,949.82
  5. Step 5: Solve for x
    x = 321,819,949.82/20,389.81
  6. Step 6: Final answer
    x = 15,783.37

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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.