Home / 20,908.05-28,851.21-12,408.72

Finding the Fourth Proportional to 20,908.05, 28,851.21 and 12,408.72

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Solution

The fourth proportional to 20,908.05, 28,851.21 and 12,408.72 is: 17,122.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.05 : 28,851.21 = 12,408.72 : x
  2. Step 2: Convert to fraction form
    20,908.05/28,851.21 = 12,408.72/x
  3. Step 3: Cross multiply
    20,908.05x = 28,851.21 × 12,408.72
  4. Step 4: Simplify right side
    20,908.05x = 358,006,586.55
  5. Step 5: Solve for x
    x = 358,006,586.55/20,908.05
  6. Step 6: Final answer
    x = 17,122.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.