Home / 81,009.72-121,115.25-68,667.75

Finding the Fourth Proportional to 81,009.72, 121,115.25 and 68,667.75

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Solution

The fourth proportional to 81,009.72, 121,115.25 and 68,667.75 is: 102,663.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,009.72 : 121,115.25 = 68,667.75 : x
  2. Step 2: Convert to fraction form
    81,009.72/121,115.25 = 68,667.75/x
  3. Step 3: Cross multiply
    81,009.72x = 121,115.25 × 68,667.75
  4. Step 4: Simplify right side
    81,009.72x = 8,316,711,708.19
  5. Step 5: Solve for x
    x = 8,316,711,708.19/81,009.72
  6. Step 6: Final answer
    x = 102,663.13

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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.