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Finding the Fourth Proportional to 13,903.10, 20,854.65 and 5,136.20

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Solution

The fourth proportional to 13,903.10, 20,854.65 and 5,136.20 is: 7,704.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,903.10 : 20,854.65 = 5,136.20 : x
  2. Step 2: Convert to fraction form
    13,903.10/20,854.65 = 5,136.20/x
  3. Step 3: Cross multiply
    13,903.10x = 20,854.65 × 5,136.20
  4. Step 4: Simplify right side
    13,903.10x = 107,113,653.33
  5. Step 5: Solve for x
    x = 107,113,653.33/13,903.10
  6. Step 6: Final answer
    x = 7,704.30

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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.