Home / 20,941.78-28,899.87-11,381.66

Finding the Fourth Proportional to 20,941.78, 28,899.87 and 11,381.66

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Solution

The fourth proportional to 20,941.78, 28,899.87 and 11,381.66 is: 15,706.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,941.78 : 28,899.87 = 11,381.66 : x
  2. Step 2: Convert to fraction form
    20,941.78/28,899.87 = 11,381.66/x
  3. Step 3: Cross multiply
    20,941.78x = 28,899.87 × 11,381.66
  4. Step 4: Simplify right side
    20,941.78x = 328,928,595.09
  5. Step 5: Solve for x
    x = 328,928,595.09/20,941.78
  6. Step 6: Final answer
    x = 15,706.82

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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.