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Finding the Fourth Proportional to 28,245.84, 38,979.90 and 15,671.40

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Solution

The fourth proportional to 28,245.84, 38,979.90 and 15,671.40 is: 21,626.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,245.84 : 38,979.90 = 15,671.40 : x
  2. Step 2: Convert to fraction form
    28,245.84/38,979.90 = 15,671.40/x
  3. Step 3: Cross multiply
    28,245.84x = 38,979.90 × 15,671.40
  4. Step 4: Simplify right side
    28,245.84x = 610,869,604.86
  5. Step 5: Solve for x
    x = 610,869,604.86/28,245.84
  6. Step 6: Final answer
    x = 21,626.89

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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.