Home / 21,138.06-29,170.45-12,185.52

Finding the Fourth Proportional to 21,138.06, 29,170.45 and 12,185.52

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Solution

The fourth proportional to 21,138.06, 29,170.45 and 12,185.52 is: 16,815.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.06 : 29,170.45 = 12,185.52 : x
  2. Step 2: Convert to fraction form
    21,138.06/29,170.45 = 12,185.52/x
  3. Step 3: Cross multiply
    21,138.06x = 29,170.45 × 12,185.52
  4. Step 4: Simplify right side
    21,138.06x = 355,457,101.88
  5. Step 5: Solve for x
    x = 355,457,101.88/21,138.06
  6. Step 6: Final answer
    x = 16,815.98

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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.