Home / 21,286.40-31,929.60-19,104.80

Finding the Fourth Proportional to 21,286.40, 31,929.60 and 19,104.80

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Solution

The fourth proportional to 21,286.40, 31,929.60 and 19,104.80 is: 28,657.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,286.40 : 31,929.60 = 19,104.80 : x
  2. Step 2: Convert to fraction form
    21,286.40/31,929.60 = 19,104.80/x
  3. Step 3: Cross multiply
    21,286.40x = 31,929.60 × 19,104.80
  4. Step 4: Simplify right side
    21,286.40x = 610,008,622.08
  5. Step 5: Solve for x
    x = 610,008,622.08/21,286.40
  6. Step 6: Final answer
    x = 28,657.20

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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.