Home / 20,879.81-31,205.06-15,269.30

Finding the Fourth Proportional to 20,879.81, 31,205.06 and 15,269.30

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Solution

The fourth proportional to 20,879.81, 31,205.06 and 15,269.30 is: 22,820.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.81 : 31,205.06 = 15,269.30 : x
  2. Step 2: Convert to fraction form
    20,879.81/31,205.06 = 15,269.30/x
  3. Step 3: Cross multiply
    20,879.81x = 31,205.06 × 15,269.30
  4. Step 4: Simplify right side
    20,879.81x = 476,479,422.66
  5. Step 5: Solve for x
    x = 476,479,422.66/20,879.81
  6. Step 6: Final answer
    x = 22,820.10

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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.