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Finding the Fourth Proportional to 28,917, 39,903.84 and 20,969.28

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Solution

The fourth proportional to 28,917, 39,903.84 and 20,969.28 is: 28,936.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,917 : 39,903.84 = 20,969.28 : x
  2. Step 2: Convert to fraction form
    28,917/39,903.84 = 20,969.28/x
  3. Step 3: Cross multiply
    28,917x = 39,903.84 × 20,969.28
  4. Step 4: Simplify right side
    28,917x = 836,754,794.04
  5. Step 5: Solve for x
    x = 836,754,794.04/28,917
  6. Step 6: Final answer
    x = 28,936.43

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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.