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Finding the Fourth Proportional to 20,995.97, 28,974.51 and 11,564.51

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Solution

The fourth proportional to 20,995.97, 28,974.51 and 11,564.51 is: 15,959.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.97 : 28,974.51 = 11,564.51 : x
  2. Step 2: Convert to fraction form
    20,995.97/28,974.51 = 11,564.51/x
  3. Step 3: Cross multiply
    20,995.97x = 28,974.51 × 11,564.51
  4. Step 4: Simplify right side
    20,995.97x = 335,075,865.77
  5. Step 5: Solve for x
    x = 335,075,865.77/20,995.97
  6. Step 6: Final answer
    x = 15,959.06

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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.