Home / 20,391.22-28,139.67-12,432.94

Finding the Fourth Proportional to 20,391.22, 28,139.67 and 12,432.94

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Solution

The fourth proportional to 20,391.22, 28,139.67 and 12,432.94 is: 17,157.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.22 : 28,139.67 = 12,432.94 : x
  2. Step 2: Convert to fraction form
    20,391.22/28,139.67 = 12,432.94/x
  3. Step 3: Cross multiply
    20,391.22x = 28,139.67 × 12,432.94
  4. Step 4: Simplify right side
    20,391.22x = 349,858,828.73
  5. Step 5: Solve for x
    x = 349,858,828.73/20,391.22
  6. Step 6: Final answer
    x = 17,157.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.