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Finding the Fourth Proportional to 91,207.81, 136,832.79 and 28,878.31

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Solution

The fourth proportional to 91,207.81, 136,832.79 and 28,878.31 is: 43,324.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,207.81 : 136,832.79 = 28,878.31 : x
  2. Step 2: Convert to fraction form
    91,207.81/136,832.79 = 28,878.31/x
  3. Step 3: Cross multiply
    91,207.81x = 136,832.79 × 28,878.31
  4. Step 4: Simplify right side
    91,207.81x = 3,951,499,727.78
  5. Step 5: Solve for x
    x = 3,951,499,727.78/91,207.81
  6. Step 6: Final answer
    x = 43,324.14

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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.