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Finding the Fourth Proportional to 20,978.78, 28,951.26 and 11,547.92

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Solution

The fourth proportional to 20,978.78, 28,951.26 and 11,547.92 is: 15,936.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.78 : 28,951.26 = 11,547.92 : x
  2. Step 2: Convert to fraction form
    20,978.78/28,951.26 = 11,547.92/x
  3. Step 3: Cross multiply
    20,978.78x = 28,951.26 × 11,547.92
  4. Step 4: Simplify right side
    20,978.78x = 334,326,834.38
  5. Step 5: Solve for x
    x = 334,326,834.38/20,978.78
  6. Step 6: Final answer
    x = 15,936.43

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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.