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Finding the Fourth Proportional to 219,620.76, 303,080.01 and 128,978.64

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Solution

The fourth proportional to 219,620.76, 303,080.01 and 128,978.64 is: 177,992.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,620.76 : 303,080.01 = 128,978.64 : x
  2. Step 2: Convert to fraction form
    219,620.76/303,080.01 = 128,978.64/x
  3. Step 3: Cross multiply
    219,620.76x = 303,080.01 × 128,978.64
  4. Step 4: Simplify right side
    219,620.76x = 39,090,847,500.99
  5. Step 5: Solve for x
    x = 39,090,847,500.99/219,620.76
  6. Step 6: Final answer
    x = 177,992.50

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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.