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Finding the Fourth Proportional to 28,208.63, 38,913.81 and 21,877.13

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Solution

The fourth proportional to 28,208.63, 38,913.81 and 21,877.13 is: 30,179.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,208.63 : 38,913.81 = 21,877.13 : x
  2. Step 2: Convert to fraction form
    28,208.63/38,913.81 = 21,877.13/x
  3. Step 3: Cross multiply
    28,208.63x = 38,913.81 × 21,877.13
  4. Step 4: Simplify right side
    28,208.63x = 851,322,480.17
  5. Step 5: Solve for x
    x = 851,322,480.17/28,208.63
  6. Step 6: Final answer
    x = 30,179.50

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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.