Home / 21,979.20-32,968.80-21,201.60

Finding the Fourth Proportional to 21,979.20, 32,968.80 and 21,201.60

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Solution

The fourth proportional to 21,979.20, 32,968.80 and 21,201.60 is: 31,802.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.20 : 32,968.80 = 21,201.60 : x
  2. Step 2: Convert to fraction form
    21,979.20/32,968.80 = 21,201.60/x
  3. Step 3: Cross multiply
    21,979.20x = 32,968.80 × 21,201.60
  4. Step 4: Simplify right side
    21,979.20x = 698,991,310.08
  5. Step 5: Solve for x
    x = 698,991,310.08/21,979.20
  6. Step 6: Final answer
    x = 31,802.40

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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.