Home / 20,951.53-28,913.60-11,391.96

Finding the Fourth Proportional to 20,951.53, 28,913.60 and 11,391.96

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Solution

The fourth proportional to 20,951.53, 28,913.60 and 11,391.96 is: 15,721.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.53 : 28,913.60 = 11,391.96 : x
  2. Step 2: Convert to fraction form
    20,951.53/28,913.60 = 11,391.96/x
  3. Step 3: Cross multiply
    20,951.53x = 28,913.60 × 11,391.96
  4. Step 4: Simplify right side
    20,951.53x = 329,382,373.13
  5. Step 5: Solve for x
    x = 329,382,373.13/20,951.53
  6. Step 6: Final answer
    x = 15,721.16

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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.