Home / 13,915.90-20,873.80-3,385.80

Finding the Fourth Proportional to 13,915.90, 20,873.80 and 3,385.80

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Solution

The fourth proportional to 13,915.90, 20,873.80 and 3,385.80 is: 5,078.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.90 : 20,873.80 = 3,385.80 : x
  2. Step 2: Convert to fraction form
    13,915.90/20,873.80 = 3,385.80/x
  3. Step 3: Cross multiply
    13,915.90x = 20,873.80 × 3,385.80
  4. Step 4: Simplify right side
    13,915.90x = 70,674,516.27
  5. Step 5: Solve for x
    x = 70,674,516.27/13,915.90
  6. Step 6: Final answer
    x = 5,078.69

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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.