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Finding the Fourth Proportional to 21,671.91, 29,792.36 and 18,635.90

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Solution

The fourth proportional to 21,671.91, 29,792.36 and 18,635.90 is: 25,618.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,671.91 : 29,792.36 = 18,635.90 : x
  2. Step 2: Convert to fraction form
    21,671.91/29,792.36 = 18,635.90/x
  3. Step 3: Cross multiply
    21,671.91x = 29,792.36 × 18,635.90
  4. Step 4: Simplify right side
    21,671.91x = 555,207,339.35
  5. Step 5: Solve for x
    x = 555,207,339.35/21,671.91
  6. Step 6: Final answer
    x = 25,618.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.