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Finding the Fourth Proportional to 28,662.58, 39,553.80 and 15,915.11

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Solution

The fourth proportional to 28,662.58, 39,553.80 and 15,915.11 is: 21,962.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,662.58 : 39,553.80 = 15,915.11 : x
  2. Step 2: Convert to fraction form
    28,662.58/39,553.80 = 15,915.11/x
  3. Step 3: Cross multiply
    28,662.58x = 39,553.80 × 15,915.11
  4. Step 4: Simplify right side
    28,662.58x = 629,503,077.92
  5. Step 5: Solve for x
    x = 629,503,077.92/28,662.58
  6. Step 6: Final answer
    x = 21,962.54

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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.