Home / 21,138.12-29,170.55-12,185.57

Finding the Fourth Proportional to 21,138.12, 29,170.55 and 12,185.57

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Solution

The fourth proportional to 21,138.12, 29,170.55 and 12,185.57 is: 16,816.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.12 : 29,170.55 = 12,185.57 : x
  2. Step 2: Convert to fraction form
    21,138.12/29,170.55 = 12,185.57/x
  3. Step 3: Cross multiply
    21,138.12x = 29,170.55 × 12,185.57
  4. Step 4: Simplify right side
    21,138.12x = 355,459,718.04
  5. Step 5: Solve for x
    x = 355,459,718.04/21,138.12
  6. Step 6: Final answer
    x = 16,816.05

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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.