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Finding the Fourth Proportional to 20,959.23, 28,912.59 and 15,915.09

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Solution

The fourth proportional to 20,959.23, 28,912.59 and 15,915.09 is: 21,954.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.23 : 28,912.59 = 15,915.09 : x
  2. Step 2: Convert to fraction form
    20,959.23/28,912.59 = 15,915.09/x
  3. Step 3: Cross multiply
    20,959.23x = 28,912.59 × 15,915.09
  4. Step 4: Simplify right side
    20,959.23x = 460,146,471.98
  5. Step 5: Solve for x
    x = 460,146,471.98/20,959.23
  6. Step 6: Final answer
    x = 21,954.36

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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.