Home / 21,115.95-29,135.67-12,161.07

Finding the Fourth Proportional to 21,115.95, 29,135.67 and 12,161.07

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Solution

The fourth proportional to 21,115.95, 29,135.67 and 12,161.07 is: 16,779.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.95 : 29,135.67 = 12,161.07 : x
  2. Step 2: Convert to fraction form
    21,115.95/29,135.67 = 12,161.07/x
  3. Step 3: Cross multiply
    21,115.95x = 29,135.67 × 12,161.07
  4. Step 4: Simplify right side
    21,115.95x = 354,320,922.37
  5. Step 5: Solve for x
    x = 354,320,922.37/21,115.95
  6. Step 6: Final answer
    x = 16,779.78

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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.