Home / 20,965.72-28,939.80-13,012.60

Finding the Fourth Proportional to 20,965.72, 28,939.80 and 13,012.60

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Solution

The fourth proportional to 20,965.72, 28,939.80 and 13,012.60 is: 17,961.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,965.72 : 28,939.80 = 13,012.60 : x
  2. Step 2: Convert to fraction form
    20,965.72/28,939.80 = 13,012.60/x
  3. Step 3: Cross multiply
    20,965.72x = 28,939.80 × 13,012.60
  4. Step 4: Simplify right side
    20,965.72x = 376,582,041.48
  5. Step 5: Solve for x
    x = 376,582,041.48/20,965.72
  6. Step 6: Final answer
    x = 17,961.80

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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.