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Finding the Fourth Proportional to 15,129.89, 20,860.44 and 11,936.87

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Solution

The fourth proportional to 15,129.89, 20,860.44 and 11,936.87 is: 16,458.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129.89 : 20,860.44 = 11,936.87 : x
  2. Step 2: Convert to fraction form
    15,129.89/20,860.44 = 11,936.87/x
  3. Step 3: Cross multiply
    15,129.89x = 20,860.44 × 11,936.87
  4. Step 4: Simplify right side
    15,129.89x = 249,008,360.42
  5. Step 5: Solve for x
    x = 249,008,360.42/15,129.89
  6. Step 6: Final answer
    x = 16,458.04

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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.