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Finding the Fourth Proportional to 18,915.99, 28,371.83 and 7,228.95

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Solution

The fourth proportional to 18,915.99, 28,371.83 and 7,228.95 is: 10,842.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.99 : 28,371.83 = 7,228.95 : x
  2. Step 2: Convert to fraction form
    18,915.99/28,371.83 = 7,228.95/x
  3. Step 3: Cross multiply
    18,915.99x = 28,371.83 × 7,228.95
  4. Step 4: Simplify right side
    18,915.99x = 205,098,504.33
  5. Step 5: Solve for x
    x = 205,098,504.33/18,915.99
  6. Step 6: Final answer
    x = 10,842.60

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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.