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Finding the Fourth Proportional to 405,990.80, 608,928.60 and 125,536.40

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Solution

The fourth proportional to 405,990.80, 608,928.60 and 125,536.40 is: 188,286.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,990.80 : 608,928.60 = 125,536.40 : x
  2. Step 2: Convert to fraction form
    405,990.80/608,928.60 = 125,536.40/x
  3. Step 3: Cross multiply
    405,990.80x = 608,928.60 × 125,536.40
  4. Step 4: Simplify right side
    405,990.80x = 76,442,704,301.04
  5. Step 5: Solve for x
    x = 76,442,704,301.04/405,990.80
  6. Step 6: Final answer
    x = 188,286.79

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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.