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Finding the Fourth Proportional to 305,090.46, 421,004.79 and 170,928.54

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Solution

The fourth proportional to 305,090.46, 421,004.79 and 170,928.54 is: 235,870.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,090.46 : 421,004.79 = 170,928.54 : x
  2. Step 2: Convert to fraction form
    305,090.46/421,004.79 = 170,928.54/x
  3. Step 3: Cross multiply
    305,090.46x = 421,004.79 × 170,928.54
  4. Step 4: Simplify right side
    305,090.46x = 71,961,734,087.71
  5. Step 5: Solve for x
    x = 71,961,734,087.71/305,090.46
  6. Step 6: Final answer
    x = 235,870.15

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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.