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Finding the Fourth Proportional to 28,872.84, 39,846.12 and 20,377.68

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Solution

The fourth proportional to 28,872.84, 39,846.12 and 20,377.68 is: 28,122.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,872.84 : 39,846.12 = 20,377.68 : x
  2. Step 2: Convert to fraction form
    28,872.84/39,846.12 = 20,377.68/x
  3. Step 3: Cross multiply
    28,872.84x = 39,846.12 × 20,377.68
  4. Step 4: Simplify right side
    28,872.84x = 811,971,482.60
  5. Step 5: Solve for x
    x = 811,971,482.60/28,872.84
  6. Step 6: Final answer
    x = 28,122.33

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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.