Home / 20,986.74-28,961.73-11,555.31

Finding the Fourth Proportional to 20,986.74, 28,961.73 and 11,555.31

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Solution

The fourth proportional to 20,986.74, 28,961.73 and 11,555.31 is: 15,946.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.74 : 28,961.73 = 11,555.31 : x
  2. Step 2: Convert to fraction form
    20,986.74/28,961.73 = 11,555.31/x
  3. Step 3: Cross multiply
    20,986.74x = 28,961.73 × 11,555.31
  4. Step 4: Simplify right side
    20,986.74x = 334,661,768.29
  5. Step 5: Solve for x
    x = 334,661,768.29/20,986.74
  6. Step 6: Final answer
    x = 15,946.34

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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.