Home / 20,990.26-31,443.21-10,428.35

Finding the Fourth Proportional to 20,990.26, 31,443.21 and 10,428.35

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Solution

The fourth proportional to 20,990.26, 31,443.21 and 10,428.35 is: 15,621.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.26 : 31,443.21 = 10,428.35 : x
  2. Step 2: Convert to fraction form
    20,990.26/31,443.21 = 10,428.35/x
  3. Step 3: Cross multiply
    20,990.26x = 31,443.21 × 10,428.35
  4. Step 4: Simplify right side
    20,990.26x = 327,900,671.12
  5. Step 5: Solve for x
    x = 327,900,671.12/20,990.26
  6. Step 6: Final answer
    x = 15,621.56

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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.