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Finding the Fourth Proportional to 21,181.91, 29,228.01 and 12,682.01

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Solution

The fourth proportional to 21,181.91, 29,228.01 and 12,682.01 is: 17,499.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,181.91 : 29,228.01 = 12,682.01 : x
  2. Step 2: Convert to fraction form
    21,181.91/29,228.01 = 12,682.01/x
  3. Step 3: Cross multiply
    21,181.91x = 29,228.01 × 12,682.01
  4. Step 4: Simplify right side
    21,181.91x = 370,669,768.96
  5. Step 5: Solve for x
    x = 370,669,768.96/21,181.91
  6. Step 6: Final answer
    x = 17,499.36

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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.