Home / 13,915.81-20,880.56-6,518.99

Finding the Fourth Proportional to 13,915.81, 20,880.56 and 6,518.99

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Solution

The fourth proportional to 13,915.81, 20,880.56 and 6,518.99 is: 9,781.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.81 : 20,880.56 = 6,518.99 : x
  2. Step 2: Convert to fraction form
    13,915.81/20,880.56 = 6,518.99/x
  3. Step 3: Cross multiply
    13,915.81x = 20,880.56 × 6,518.99
  4. Step 4: Simplify right side
    13,915.81x = 136,120,161.83
  5. Step 5: Solve for x
    x = 136,120,161.83/13,915.81
  6. Step 6: Final answer
    x = 9,781.69

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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.