Home / 20,728.72-28,604.21-12,228.89

Finding the Fourth Proportional to 20,728.72, 28,604.21 and 12,228.89

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Solution

The fourth proportional to 20,728.72, 28,604.21 and 12,228.89 is: 16,875.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.72 : 28,604.21 = 12,228.89 : x
  2. Step 2: Convert to fraction form
    20,728.72/28,604.21 = 12,228.89/x
  3. Step 3: Cross multiply
    20,728.72x = 28,604.21 × 12,228.89
  4. Step 4: Simplify right side
    20,728.72x = 349,797,594.61
  5. Step 5: Solve for x
    x = 349,797,594.61/20,728.72
  6. Step 6: Final answer
    x = 16,875.02

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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.