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Finding the Fourth Proportional to 28,236.84, 38,966.84 and 15,661.59

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Solution

The fourth proportional to 28,236.84, 38,966.84 and 15,661.59 is: 21,612.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,236.84 : 38,966.84 = 15,661.59 : x
  2. Step 2: Convert to fraction form
    28,236.84/38,966.84 = 15,661.59/x
  3. Step 3: Cross multiply
    28,236.84x = 38,966.84 × 15,661.59
  4. Step 4: Simplify right side
    28,236.84x = 610,282,671.68
  5. Step 5: Solve for x
    x = 610,282,671.68/28,236.84
  6. Step 6: Final answer
    x = 21,612.99

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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.