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Finding the Fourth Proportional to 28,811, 39,759.18 and 15,563

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Solution

The fourth proportional to 28,811, 39,759.18 and 15,563 is: 21,476.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,811 : 39,759.18 = 15,563 : x
  2. Step 2: Convert to fraction form
    28,811/39,759.18 = 15,563/x
  3. Step 3: Cross multiply
    28,811x = 39,759.18 × 15,563
  4. Step 4: Simplify right side
    28,811x = 618,772,118.34
  5. Step 5: Solve for x
    x = 618,772,118.34/28,811
  6. Step 6: Final answer
    x = 21,476.94

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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.