Home / 21,190.50-29,242.58-12,115.77

Finding the Fourth Proportional to 21,190.50, 29,242.58 and 12,115.77

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Solution

The fourth proportional to 21,190.50, 29,242.58 and 12,115.77 is: 16,719.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,190.50 : 29,242.58 = 12,115.77 : x
  2. Step 2: Convert to fraction form
    21,190.50/29,242.58 = 12,115.77/x
  3. Step 3: Cross multiply
    21,190.50x = 29,242.58 × 12,115.77
  4. Step 4: Simplify right side
    21,190.50x = 354,296,166.69
  5. Step 5: Solve for x
    x = 354,296,166.69/21,190.50
  6. Step 6: Final answer
    x = 16,719.58

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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.