Home / 21,090.11-29,106.34-12,142.85

Finding the Fourth Proportional to 21,090.11, 29,106.34 and 12,142.85

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Solution

The fourth proportional to 21,090.11, 29,106.34 and 12,142.85 is: 16,758.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.11 : 29,106.34 = 12,142.85 : x
  2. Step 2: Convert to fraction form
    21,090.11/29,106.34 = 12,142.85/x
  3. Step 3: Cross multiply
    21,090.11x = 29,106.34 × 12,142.85
  4. Step 4: Simplify right side
    21,090.11x = 353,433,744.78
  5. Step 5: Solve for x
    x = 353,433,744.78/21,090.11
  6. Step 6: Final answer
    x = 16,758.27

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Double scale
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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.