Home / 20,851.20-31,101.12-19,399.68

Finding the Fourth Proportional to 20,851.20, 31,101.12 and 19,399.68

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Solution

The fourth proportional to 20,851.20, 31,101.12 and 19,399.68 is: 28,936.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,851.20 : 31,101.12 = 19,399.68 : x
  2. Step 2: Convert to fraction form
    20,851.20/31,101.12 = 19,399.68/x
  3. Step 3: Cross multiply
    20,851.20x = 31,101.12 × 19,399.68
  4. Step 4: Simplify right side
    20,851.20x = 603,351,775.64
  5. Step 5: Solve for x
    x = 603,351,775.64/20,851.20
  6. Step 6: Final answer
    x = 28,936.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.