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Finding the Fourth Proportional to 13,813.70, 20,720.55 and 7,908.80

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Solution

The fourth proportional to 13,813.70, 20,720.55 and 7,908.80 is: 11,863.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,813.70 : 20,720.55 = 7,908.80 : x
  2. Step 2: Convert to fraction form
    13,813.70/20,720.55 = 7,908.80/x
  3. Step 3: Cross multiply
    13,813.70x = 20,720.55 × 7,908.80
  4. Step 4: Simplify right side
    13,813.70x = 163,874,685.84
  5. Step 5: Solve for x
    x = 163,874,685.84/13,813.70
  6. Step 6: Final answer
    x = 11,863.20

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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.