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Finding the Fourth Proportional to 138,672.19, 208,039.61 and 43,908.13

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Solution

The fourth proportional to 138,672.19, 208,039.61 and 43,908.13 is: 65,872.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,672.19 : 208,039.61 = 43,908.13 : x
  2. Step 2: Convert to fraction form
    138,672.19/208,039.61 = 43,908.13/x
  3. Step 3: Cross multiply
    138,672.19x = 208,039.61 × 43,908.13
  4. Step 4: Simplify right side
    138,672.19x = 9,134,630,241.03
  5. Step 5: Solve for x
    x = 9,134,630,241.03/138,672.19
  6. Step 6: Final answer
    x = 65,872.11

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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.