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Finding the Fourth Proportional to 21,379.50, 29,503.50 and 11,820

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Solution

The fourth proportional to 21,379.50, 29,503.50 and 11,820 is: 16,311.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379.50 : 29,503.50 = 11,820 : x
  2. Step 2: Convert to fraction form
    21,379.50/29,503.50 = 11,820/x
  3. Step 3: Cross multiply
    21,379.50x = 29,503.50 × 11,820
  4. Step 4: Simplify right side
    21,379.50x = 348,731,370
  5. Step 5: Solve for x
    x = 348,731,370/21,379.50
  6. Step 6: Final answer
    x = 16,311.48

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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.