Home / 20,986.97-28,962.09-11,555.51

Finding the Fourth Proportional to 20,986.97, 28,962.09 and 11,555.51

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Solution

The fourth proportional to 20,986.97, 28,962.09 and 11,555.51 is: 15,946.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.97 : 28,962.09 = 11,555.51 : x
  2. Step 2: Convert to fraction form
    20,986.97/28,962.09 = 11,555.51/x
  3. Step 3: Cross multiply
    20,986.97x = 28,962.09 × 11,555.51
  4. Step 4: Simplify right side
    20,986.97x = 334,671,575.81
  5. Step 5: Solve for x
    x = 334,671,575.81/20,986.97
  6. Step 6: Final answer
    x = 15,946.64

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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.