Home / 18,915.20-28,383.60-7,236.80

Finding the Fourth Proportional to 18,915.20, 28,383.60 and 7,236.80

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Solution

The fourth proportional to 18,915.20, 28,383.60 and 7,236.80 is: 10,859.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.20 : 28,383.60 = 7,236.80 : x
  2. Step 2: Convert to fraction form
    18,915.20/28,383.60 = 7,236.80/x
  3. Step 3: Cross multiply
    18,915.20x = 28,383.60 × 7,236.80
  4. Step 4: Simplify right side
    18,915.20x = 205,406,436.48
  5. Step 5: Solve for x
    x = 205,406,436.48/18,915.20
  6. Step 6: Final answer
    x = 10,859.33

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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.