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Finding the Fourth Proportional to 120,879.39, 166,803.52 and 66,428.69

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Solution

The fourth proportional to 120,879.39, 166,803.52 and 66,428.69 is: 91,666.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,879.39 : 166,803.52 = 66,428.69 : x
  2. Step 2: Convert to fraction form
    120,879.39/166,803.52 = 66,428.69/x
  3. Step 3: Cross multiply
    120,879.39x = 166,803.52 × 66,428.69
  4. Step 4: Simplify right side
    120,879.39x = 11,080,538,988.85
  5. Step 5: Solve for x
    x = 11,080,538,988.85/120,879.39
  6. Step 6: Final answer
    x = 91,666.07

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1.5x scale

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.