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Finding the Fourth Proportional to 121,437.79, 181,996.75 and 68,128.75

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Solution

The fourth proportional to 121,437.79, 181,996.75 and 68,128.75 is: 102,103.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,437.79 : 181,996.75 = 68,128.75 : x
  2. Step 2: Convert to fraction form
    121,437.79/181,996.75 = 68,128.75/x
  3. Step 3: Cross multiply
    121,437.79x = 181,996.75 × 68,128.75
  4. Step 4: Simplify right side
    121,437.79x = 12,399,211,081.56
  5. Step 5: Solve for x
    x = 12,399,211,081.56/121,437.79
  6. Step 6: Final answer
    x = 102,103.40

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1.5x scale

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.