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Finding the Fourth Proportional to 28,661.36, 39,551.96 and 15,914.16

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Solution

The fourth proportional to 28,661.36, 39,551.96 and 15,914.16 is: 21,961.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,661.36 : 39,551.96 = 15,914.16 : x
  2. Step 2: Convert to fraction form
    28,661.36/39,551.96 = 15,914.16/x
  3. Step 3: Cross multiply
    28,661.36x = 39,551.96 × 15,914.16
  4. Step 4: Simplify right side
    28,661.36x = 629,436,140.18
  5. Step 5: Solve for x
    x = 629,436,140.18/28,661.36
  6. Step 6: Final answer
    x = 21,961.14

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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.