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Finding the Fourth Proportional to 155,960.94, 215,247.15 and 87,991.86

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Solution

The fourth proportional to 155,960.94, 215,247.15 and 87,991.86 is: 121,440.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,960.94 : 215,247.15 = 87,991.86 : x
  2. Step 2: Convert to fraction form
    155,960.94/215,247.15 = 87,991.86/x
  3. Step 3: Cross multiply
    155,960.94x = 215,247.15 × 87,991.86
  4. Step 4: Simplify right side
    155,960.94x = 18,939,996,880.05
  5. Step 5: Solve for x
    x = 18,939,996,880.05/155,960.94
  6. Step 6: Final answer
    x = 121,440.65

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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.