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Finding the Fourth Proportional to 225,620.30, 311,316.54 and 128,779.94

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Solution

The fourth proportional to 225,620.30, 311,316.54 and 128,779.94 is: 177,693.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,620.30 : 311,316.54 = 128,779.94 : x
  2. Step 2: Convert to fraction form
    225,620.30/311,316.54 = 128,779.94/x
  3. Step 3: Cross multiply
    225,620.30x = 311,316.54 × 128,779.94
  4. Step 4: Simplify right side
    225,620.30x = 40,091,325,342.21
  5. Step 5: Solve for x
    x = 40,091,325,342.21/225,620.30
  6. Step 6: Final answer
    x = 177,693.79

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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.