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Finding the Fourth Proportional to 51,291.38, 76,878.74 and 21,690.74

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Solution

The fourth proportional to 51,291.38, 76,878.74 and 21,690.74 is: 32,511.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,291.38 : 76,878.74 = 21,690.74 : x
  2. Step 2: Convert to fraction form
    51,291.38/76,878.74 = 21,690.74/x
  3. Step 3: Cross multiply
    51,291.38x = 76,878.74 × 21,690.74
  4. Step 4: Simplify right side
    51,291.38x = 1,667,556,760.87
  5. Step 5: Solve for x
    x = 1,667,556,760.87/51,291.38
  6. Step 6: Final answer
    x = 32,511.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.