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Finding the Fourth Proportional to 155,917.15, 215,199.05 and 98,520.03

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Solution

The fourth proportional to 155,917.15, 215,199.05 and 98,520.03 is: 135,978.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,917.15 : 215,199.05 = 98,520.03 : x
  2. Step 2: Convert to fraction form
    155,917.15/215,199.05 = 98,520.03/x
  3. Step 3: Cross multiply
    155,917.15x = 215,199.05 × 98,520.03
  4. Step 4: Simplify right side
    155,917.15x = 21,201,416,861.97
  5. Step 5: Solve for x
    x = 21,201,416,861.97/155,917.15
  6. Step 6: Final answer
    x = 135,978.74

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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.