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Finding the Fourth Proportional to 28,911.90, 43,371.90 and 12,271.80

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Solution

The fourth proportional to 28,911.90, 43,371.90 and 12,271.80 is: 18,409.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,911.90 : 43,371.90 = 12,271.80 : x
  2. Step 2: Convert to fraction form
    28,911.90/43,371.90 = 12,271.80/x
  3. Step 3: Cross multiply
    28,911.90x = 43,371.90 × 12,271.80
  4. Step 4: Simplify right side
    28,911.90x = 532,251,282.42
  5. Step 5: Solve for x
    x = 532,251,282.42/28,911.90
  6. Step 6: Final answer
    x = 18,409.42

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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.