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Finding the Fourth Proportional to 28,578.99, 42,872.13 and 8,858.73

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Solution

The fourth proportional to 28,578.99, 42,872.13 and 8,858.73 is: 13,289.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,578.99 : 42,872.13 = 8,858.73 : x
  2. Step 2: Convert to fraction form
    28,578.99/42,872.13 = 8,858.73/x
  3. Step 3: Cross multiply
    28,578.99x = 42,872.13 × 8,858.73
  4. Step 4: Simplify right side
    28,578.99x = 379,792,624.19
  5. Step 5: Solve for x
    x = 379,792,624.19/28,578.99
  6. Step 6: Final answer
    x = 13,289.22

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.