Home / 20,717.90-31,080.90-8,235.80

Finding the Fourth Proportional to 20,717.90, 31,080.90 and 8,235.80

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Solution

The fourth proportional to 20,717.90, 31,080.90 and 8,235.80 is: 12,355.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,717.90 : 31,080.90 = 8,235.80 : x
  2. Step 2: Convert to fraction form
    20,717.90/31,080.90 = 8,235.80/x
  3. Step 3: Cross multiply
    20,717.90x = 31,080.90 × 8,235.80
  4. Step 4: Simplify right side
    20,717.90x = 255,976,076.22
  5. Step 5: Solve for x
    x = 255,976,076.22/20,717.90
  6. Step 6: Final answer
    x = 12,355.31

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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.