Home / 20,386.08-28,131.84-11,431.80

Finding the Fourth Proportional to 20,386.08, 28,131.84 and 11,431.80

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Solution

The fourth proportional to 20,386.08, 28,131.84 and 11,431.80 is: 15,775.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,386.08 : 28,131.84 = 11,431.80 : x
  2. Step 2: Convert to fraction form
    20,386.08/28,131.84 = 11,431.80/x
  3. Step 3: Cross multiply
    20,386.08x = 28,131.84 × 11,431.80
  4. Step 4: Simplify right side
    20,386.08x = 321,597,568.51
  5. Step 5: Solve for x
    x = 321,597,568.51/20,386.08
  6. Step 6: Final answer
    x = 15,775.35

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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.