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Finding the Fourth Proportional to 20,571.54, 30,855.76 and 7,423.91

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Solution

The fourth proportional to 20,571.54, 30,855.76 and 7,423.91 is: 11,135.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,571.54 : 30,855.76 = 7,423.91 : x
  2. Step 2: Convert to fraction form
    20,571.54/30,855.76 = 7,423.91/x
  3. Step 3: Cross multiply
    20,571.54x = 30,855.76 × 7,423.91
  4. Step 4: Simplify right side
    20,571.54x = 229,070,193.82
  5. Step 5: Solve for x
    x = 229,070,193.82/20,571.54
  6. Step 6: Final answer
    x = 11,135.30

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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.