Home / 20,382.42-28,128.78-11,430.84

Finding the Fourth Proportional to 20,382.42, 28,128.78 and 11,430.84

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Solution

The fourth proportional to 20,382.42, 28,128.78 and 11,430.84 is: 15,775.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,382.42 : 28,128.78 = 11,430.84 : x
  2. Step 2: Convert to fraction form
    20,382.42/28,128.78 = 11,430.84/x
  3. Step 3: Cross multiply
    20,382.42x = 28,128.78 × 11,430.84
  4. Step 4: Simplify right side
    20,382.42x = 321,535,583.58
  5. Step 5: Solve for x
    x = 321,535,583.58/20,382.42
  6. Step 6: Final answer
    x = 15,775.14

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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.