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Finding the Fourth Proportional to 20,975.00, 28,945.71 and 11,543.90

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Solution

The fourth proportional to 20,975.00, 28,945.71 and 11,543.90 is: 15,930.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.00 : 28,945.71 = 11,543.90 : x
  2. Step 2: Convert to fraction form
    20,975.00/28,945.71 = 11,543.90/x
  3. Step 3: Cross multiply
    20,975.00x = 28,945.71 × 11,543.90
  4. Step 4: Simplify right side
    20,975.00x = 334,146,236.94
  5. Step 5: Solve for x
    x = 334,146,236.94/20,975.00
  6. Step 6: Final answer
    x = 15,930.69

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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.