Home / 20,867.40-31,301.10-12,119.40

Finding the Fourth Proportional to 20,867.40, 31,301.10 and 12,119.40

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Solution

The fourth proportional to 20,867.40, 31,301.10 and 12,119.40 is: 18,179.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,867.40 : 31,301.10 = 12,119.40 : x
  2. Step 2: Convert to fraction form
    20,867.40/31,301.10 = 12,119.40/x
  3. Step 3: Cross multiply
    20,867.40x = 31,301.10 × 12,119.40
  4. Step 4: Simplify right side
    20,867.40x = 379,350,551.34
  5. Step 5: Solve for x
    x = 379,350,551.34/20,867.40
  6. Step 6: Final answer
    x = 18,179.10

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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.