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Finding the Fourth Proportional to 13,438.40, 20,114.40 and 10,500.80

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Solution

The fourth proportional to 13,438.40, 20,114.40 and 10,500.80 is: 15,717.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,438.40 : 20,114.40 = 10,500.80 : x
  2. Step 2: Convert to fraction form
    13,438.40/20,114.40 = 10,500.80/x
  3. Step 3: Cross multiply
    13,438.40x = 20,114.40 × 10,500.80
  4. Step 4: Simplify right side
    13,438.40x = 211,217,291.52
  5. Step 5: Solve for x
    x = 211,217,291.52/13,438.40
  6. Step 6: Final answer
    x = 15,717.44

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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.