Home / 20,915.99-28,863.86-11,355.67

Finding the Fourth Proportional to 20,915.99, 28,863.86 and 11,355.67

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Solution

The fourth proportional to 20,915.99, 28,863.86 and 11,355.67 is: 15,670.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.99 : 28,863.86 = 11,355.67 : x
  2. Step 2: Convert to fraction form
    20,915.99/28,863.86 = 11,355.67/x
  3. Step 3: Cross multiply
    20,915.99x = 28,863.86 × 11,355.67
  4. Step 4: Simplify right side
    20,915.99x = 327,768,340.15
  5. Step 5: Solve for x
    x = 327,768,340.15/20,915.99
  6. Step 6: Final answer
    x = 15,670.71

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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.