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Finding the Fourth Proportional to 155,961, 215,247.24 and 87,991.92

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Solution

The fourth proportional to 155,961, 215,247.24 and 87,991.92 is: 121,440.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,961 : 215,247.24 = 87,991.92 : x
  2. Step 2: Convert to fraction form
    155,961/215,247.24 = 87,991.92/x
  3. Step 3: Cross multiply
    155,961x = 215,247.24 × 87,991.92
  4. Step 4: Simplify right side
    155,961x = 18,940,017,922.30
  5. Step 5: Solve for x
    x = 18,940,017,922.30/155,961
  6. Step 6: Final answer
    x = 121,440.73

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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.