Home / 20,711.20-31,066.80-11,938.90

Finding the Fourth Proportional to 20,711.20, 31,066.80 and 11,938.90

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Solution

The fourth proportional to 20,711.20, 31,066.80 and 11,938.90 is: 17,908.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,711.20 : 31,066.80 = 11,938.90 : x
  2. Step 2: Convert to fraction form
    20,711.20/31,066.80 = 11,938.90/x
  3. Step 3: Cross multiply
    20,711.20x = 31,066.80 × 11,938.90
  4. Step 4: Simplify right side
    20,711.20x = 370,903,418.52
  5. Step 5: Solve for x
    x = 370,903,418.52/20,711.20
  6. Step 6: Final answer
    x = 17,908.35

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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.