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Finding the Fourth Proportional to 20,953.99, 28,915.94 and 11,522.55

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Solution

The fourth proportional to 20,953.99, 28,915.94 and 11,522.55 is: 15,900.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,953.99 : 28,915.94 = 11,522.55 : x
  2. Step 2: Convert to fraction form
    20,953.99/28,915.94 = 11,522.55/x
  3. Step 3: Cross multiply
    20,953.99x = 28,915.94 × 11,522.55
  4. Step 4: Simplify right side
    20,953.99x = 333,185,436.87
  5. Step 5: Solve for x
    x = 333,185,436.87/20,953.99
  6. Step 6: Final answer
    x = 15,900.81

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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.