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Finding the Fourth Proportional to 21,888.36, 30,205.98 and 12,456.99

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Solution

The fourth proportional to 21,888.36, 30,205.98 and 12,456.99 is: 17,190.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,888.36 : 30,205.98 = 12,456.99 : x
  2. Step 2: Convert to fraction form
    21,888.36/30,205.98 = 12,456.99/x
  3. Step 3: Cross multiply
    21,888.36x = 30,205.98 × 12,456.99
  4. Step 4: Simplify right side
    21,888.36x = 376,275,590.80
  5. Step 5: Solve for x
    x = 376,275,590.80/21,888.36
  6. Step 6: Final answer
    x = 17,190.67

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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.