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Finding the Fourth Proportional to 21,107.84, 31,661.84 and 18,671.36

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Solution

The fourth proportional to 21,107.84, 31,661.84 and 18,671.36 is: 28,007.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,107.84 : 31,661.84 = 18,671.36 : x
  2. Step 2: Convert to fraction form
    21,107.84/31,661.84 = 18,671.36/x
  3. Step 3: Cross multiply
    21,107.84x = 31,661.84 × 18,671.36
  4. Step 4: Simplify right side
    21,107.84x = 591,169,612.90
  5. Step 5: Solve for x
    x = 591,169,612.90/21,107.84
  6. Step 6: Final answer
    x = 28,007.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.