Home / 21,186.60-31,779.90-20,797.80

Finding the Fourth Proportional to 21,186.60, 31,779.90 and 20,797.80

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Solution

The fourth proportional to 21,186.60, 31,779.90 and 20,797.80 is: 31,196.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.60 : 31,779.90 = 20,797.80 : x
  2. Step 2: Convert to fraction form
    21,186.60/31,779.90 = 20,797.80/x
  3. Step 3: Cross multiply
    21,186.60x = 31,779.90 × 20,797.80
  4. Step 4: Simplify right side
    21,186.60x = 660,952,004.22
  5. Step 5: Solve for x
    x = 660,952,004.22/21,186.60
  6. Step 6: Final answer
    x = 31,196.70

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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.