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Finding the Fourth Proportional to 28,661.96, 39,553.04 and 15,915.14

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Solution

The fourth proportional to 28,661.96, 39,553.04 and 15,915.14 is: 21,962.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,661.96 : 39,553.04 = 15,915.14 : x
  2. Step 2: Convert to fraction form
    28,661.96/39,553.04 = 15,915.14/x
  3. Step 3: Cross multiply
    28,661.96x = 39,553.04 × 15,915.14
  4. Step 4: Simplify right side
    28,661.96x = 629,492,169.03
  5. Step 5: Solve for x
    x = 629,492,169.03/28,661.96
  6. Step 6: Final answer
    x = 21,962.64

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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.