Home / 20,771.40-31,164.39-12,971.10

Finding the Fourth Proportional to 20,771.40, 31,164.39 and 12,971.10

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Solution

The fourth proportional to 20,771.40, 31,164.39 and 12,971.10 is: 19,461.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,771.40 : 31,164.39 = 12,971.10 : x
  2. Step 2: Convert to fraction form
    20,771.40/31,164.39 = 12,971.10/x
  3. Step 3: Cross multiply
    20,771.40x = 31,164.39 × 12,971.10
  4. Step 4: Simplify right side
    20,771.40x = 404,236,419.13
  5. Step 5: Solve for x
    x = 404,236,419.13/20,771.40
  6. Step 6: Final answer
    x = 19,461.20

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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.