Home / 21,107.40-31,661.10-13,234.20

Finding the Fourth Proportional to 21,107.40, 31,661.10 and 13,234.20

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Solution

The fourth proportional to 21,107.40, 31,661.10 and 13,234.20 is: 19,851.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,107.40 : 31,661.10 = 13,234.20 : x
  2. Step 2: Convert to fraction form
    21,107.40/31,661.10 = 13,234.20/x
  3. Step 3: Cross multiply
    21,107.40x = 31,661.10 × 13,234.20
  4. Step 4: Simplify right side
    21,107.40x = 419,009,329.62
  5. Step 5: Solve for x
    x = 419,009,329.62/21,107.40
  6. Step 6: Final answer
    x = 19,851.30

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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.