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Finding the Fourth Proportional to 12,129.30, 16,719.30 and 11,112.30

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Solution

The fourth proportional to 12,129.30, 16,719.30 and 11,112.30 is: 15,317.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,129.30 : 16,719.30 = 11,112.30 : x
  2. Step 2: Convert to fraction form
    12,129.30/16,719.30 = 11,112.30/x
  3. Step 3: Cross multiply
    12,129.30x = 16,719.30 × 11,112.30
  4. Step 4: Simplify right side
    12,129.30x = 185,789,877.39
  5. Step 5: Solve for x
    x = 185,789,877.39/12,129.30
  6. Step 6: Final answer
    x = 15,317.44

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1.5x scale

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.