Home / 21,316.40-31,974.60-20,106.80

Finding the Fourth Proportional to 21,316.40, 31,974.60 and 20,106.80

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Solution

The fourth proportional to 21,316.40, 31,974.60 and 20,106.80 is: 30,160.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,316.40 : 31,974.60 = 20,106.80 : x
  2. Step 2: Convert to fraction form
    21,316.40/31,974.60 = 20,106.80/x
  3. Step 3: Cross multiply
    21,316.40x = 31,974.60 × 20,106.80
  4. Step 4: Simplify right side
    21,316.40x = 642,906,887.28
  5. Step 5: Solve for x
    x = 642,906,887.28/21,316.40
  6. Step 6: Final answer
    x = 30,160.20

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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.