Home / 21,118.32-29,143.12-11,687.44

Finding the Fourth Proportional to 21,118.32, 29,143.12 and 11,687.44

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Solution

The fourth proportional to 21,118.32, 29,143.12 and 11,687.44 is: 16,128.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.32 : 29,143.12 = 11,687.44 : x
  2. Step 2: Convert to fraction form
    21,118.32/29,143.12 = 11,687.44/x
  3. Step 3: Cross multiply
    21,118.32x = 29,143.12 × 11,687.44
  4. Step 4: Simplify right side
    21,118.32x = 340,608,466.41
  5. Step 5: Solve for x
    x = 340,608,466.41/21,118.32
  6. Step 6: Final answer
    x = 16,128.58

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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.