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Finding the Fourth Proportional to 28,236.47, 38,965.71 and 15,661.22

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Solution

The fourth proportional to 28,236.47, 38,965.71 and 15,661.22 is: 21,612.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,236.47 : 38,965.71 = 15,661.22 : x
  2. Step 2: Convert to fraction form
    28,236.47/38,965.71 = 15,661.22/x
  3. Step 3: Cross multiply
    28,236.47x = 38,965.71 × 15,661.22
  4. Step 4: Simplify right side
    28,236.47x = 610,250,361.94
  5. Step 5: Solve for x
    x = 610,250,361.94/28,236.47
  6. Step 6: Final answer
    x = 21,612.14

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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.