Home / 20,987.42-31,485.75-6,951.80

Finding the Fourth Proportional to 20,987.42, 31,485.75 and 6,951.80

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Solution

The fourth proportional to 20,987.42, 31,485.75 and 6,951.80 is: 10,429.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.42 : 31,485.75 = 6,951.80 : x
  2. Step 2: Convert to fraction form
    20,987.42/31,485.75 = 6,951.80/x
  3. Step 3: Cross multiply
    20,987.42x = 31,485.75 × 6,951.80
  4. Step 4: Simplify right side
    20,987.42x = 218,882,636.85
  5. Step 5: Solve for x
    x = 218,882,636.85/20,987.42
  6. Step 6: Final answer
    x = 10,429.23

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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.