Home / 13,915.40-20,861.40-6,515.96

Finding the Fourth Proportional to 13,915.40, 20,861.40 and 6,515.96

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Solution

The fourth proportional to 13,915.40, 20,861.40 and 6,515.96 is: 9,768.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.40 : 20,861.40 = 6,515.96 : x
  2. Step 2: Convert to fraction form
    13,915.40/20,861.40 = 6,515.96/x
  3. Step 3: Cross multiply
    13,915.40x = 20,861.40 × 6,515.96
  4. Step 4: Simplify right side
    13,915.40x = 135,932,047.94
  5. Step 5: Solve for x
    x = 135,932,047.94/13,915.40
  6. Step 6: Final answer
    x = 9,768.46

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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.