Home / 21,830.45-30,125.05-12,139.54

Finding the Fourth Proportional to 21,830.45, 30,125.05 and 12,139.54

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Solution

The fourth proportional to 21,830.45, 30,125.05 and 12,139.54 is: 16,752.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,830.45 : 30,125.05 = 12,139.54 : x
  2. Step 2: Convert to fraction form
    21,830.45/30,125.05 = 12,139.54/x
  3. Step 3: Cross multiply
    21,830.45x = 30,125.05 × 12,139.54
  4. Step 4: Simplify right side
    21,830.45x = 365,704,143.82
  5. Step 5: Solve for x
    x = 365,704,143.82/21,830.45
  6. Step 6: Final answer
    x = 16,752.02

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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.