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Finding the Fourth Proportional to 405,939.20, 608,908.80 and 125,542.40

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Solution

The fourth proportional to 405,939.20, 608,908.80 and 125,542.40 is: 188,313.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,939.20 : 608,908.80 = 125,542.40 : x
  2. Step 2: Convert to fraction form
    405,939.20/608,908.80 = 125,542.40/x
  3. Step 3: Cross multiply
    405,939.20x = 608,908.80 × 125,542.40
  4. Step 4: Simplify right side
    405,939.20x = 76,443,872,133.12
  5. Step 5: Solve for x
    x = 76,443,872,133.12/405,939.20
  6. Step 6: Final answer
    x = 188,313.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.