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Finding the Fourth Proportional to 12,913.20, 19,408.20 and 11,223.60

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Solution

The fourth proportional to 12,913.20, 19,408.20 and 11,223.60 is: 16,868.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,913.20 : 19,408.20 = 11,223.60 : x
  2. Step 2: Convert to fraction form
    12,913.20/19,408.20 = 11,223.60/x
  3. Step 3: Cross multiply
    12,913.20x = 19,408.20 × 11,223.60
  4. Step 4: Simplify right side
    12,913.20x = 217,829,873.52
  5. Step 5: Solve for x
    x = 217,829,873.52/12,913.20
  6. Step 6: Final answer
    x = 16,868.78

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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.