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Finding the Fourth Proportional to 43,291.96, 64,939.02 and 12,129.64

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Solution

The fourth proportional to 43,291.96, 64,939.02 and 12,129.64 is: 18,194.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,291.96 : 64,939.02 = 12,129.64 : x
  2. Step 2: Convert to fraction form
    43,291.96/64,939.02 = 12,129.64/x
  3. Step 3: Cross multiply
    43,291.96x = 64,939.02 × 12,129.64
  4. Step 4: Simplify right side
    43,291.96x = 787,686,934.55
  5. Step 5: Solve for x
    x = 787,686,934.55/43,291.96
  6. Step 6: Final answer
    x = 18,194.76

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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.