Home / 20,900.79-31,351.19-10,505.25

Finding the Fourth Proportional to 20,900.79, 31,351.19 and 10,505.25

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Solution

The fourth proportional to 20,900.79, 31,351.19 and 10,505.25 is: 15,757.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.79 : 31,351.19 = 10,505.25 : x
  2. Step 2: Convert to fraction form
    20,900.79/31,351.19 = 10,505.25/x
  3. Step 3: Cross multiply
    20,900.79x = 31,351.19 × 10,505.25
  4. Step 4: Simplify right side
    20,900.79x = 329,352,036.22
  5. Step 5: Solve for x
    x = 329,352,036.22/20,900.79
  6. Step 6: Final answer
    x = 15,757.88

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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.