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Finding the Fourth Proportional to 159,722.58, 220,416.12 and 87,129.48

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Solution

The fourth proportional to 159,722.58, 220,416.12 and 87,129.48 is: 120,238.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,722.58 : 220,416.12 = 87,129.48 : x
  2. Step 2: Convert to fraction form
    159,722.58/220,416.12 = 87,129.48/x
  3. Step 3: Cross multiply
    159,722.58x = 220,416.12 × 87,129.48
  4. Step 4: Simplify right side
    159,722.58x = 19,204,741,919.22
  5. Step 5: Solve for x
    x = 19,204,741,919.22/159,722.58
  6. Step 6: Final answer
    x = 120,238.11

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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.