Home / 20,381.20-28,126.08-11,428.72

Finding the Fourth Proportional to 20,381.20, 28,126.08 and 11,428.72

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Solution

The fourth proportional to 20,381.20, 28,126.08 and 11,428.72 is: 15,771.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,381.20 : 28,126.08 = 11,428.72 : x
  2. Step 2: Convert to fraction form
    20,381.20/28,126.08 = 11,428.72/x
  3. Step 3: Cross multiply
    20,381.20x = 28,126.08 × 11,428.72
  4. Step 4: Simplify right side
    20,381.20x = 321,445,093.02
  5. Step 5: Solve for x
    x = 321,445,093.02/20,381.20
  6. Step 6: Final answer
    x = 15,771.65

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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.