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Finding the Fourth Proportional to 136,979.65, 189,007.86 and 76,530.97

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Solution

The fourth proportional to 136,979.65, 189,007.86 and 76,530.97 is: 105,599.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,979.65 : 189,007.86 = 76,530.97 : x
  2. Step 2: Convert to fraction form
    136,979.65/189,007.86 = 76,530.97/x
  3. Step 3: Cross multiply
    136,979.65x = 189,007.86 × 76,530.97
  4. Step 4: Simplify right side
    136,979.65x = 14,464,954,863.42
  5. Step 5: Solve for x
    x = 14,464,954,863.42/136,979.65
  6. Step 6: Final answer
    x = 105,599.30

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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.