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Finding the Fourth Proportional to 21,768.99, 30,041.55 and 12,211.00

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Solution

The fourth proportional to 21,768.99, 30,041.55 and 12,211.00 is: 16,851.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,768.99 : 30,041.55 = 12,211.00 : x
  2. Step 2: Convert to fraction form
    21,768.99/30,041.55 = 12,211.00/x
  3. Step 3: Cross multiply
    21,768.99x = 30,041.55 × 12,211.00
  4. Step 4: Simplify right side
    21,768.99x = 366,837,246.15
  5. Step 5: Solve for x
    x = 366,837,246.15/21,768.99
  6. Step 6: Final answer
    x = 16,851.37

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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.