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Finding the Fourth Proportional to 20,995.84, 28,974.72 and 11,564.92

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Solution

The fourth proportional to 20,995.84, 28,974.72 and 11,564.92 is: 15,959.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.84 : 28,974.72 = 11,564.92 : x
  2. Step 2: Convert to fraction form
    20,995.84/28,974.72 = 11,564.92/x
  3. Step 3: Cross multiply
    20,995.84x = 28,974.72 × 11,564.92
  4. Step 4: Simplify right side
    20,995.84x = 335,090,318.82
  5. Step 5: Solve for x
    x = 335,090,318.82/20,995.84
  6. Step 6: Final answer
    x = 15,959.84

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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.