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Finding the Fourth Proportional to 120,018.51, 165,623.57 and 66,305.79

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Solution

The fourth proportional to 120,018.51, 165,623.57 and 66,305.79 is: 91,500.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,018.51 : 165,623.57 = 66,305.79 : x
  2. Step 2: Convert to fraction form
    120,018.51/165,623.57 = 66,305.79/x
  3. Step 3: Cross multiply
    120,018.51x = 165,623.57 × 66,305.79
  4. Step 4: Simplify right side
    120,018.51x = 10,981,800,491.82
  5. Step 5: Solve for x
    x = 10,981,800,491.82/120,018.51
  6. Step 6: Final answer
    x = 91,500.89

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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.