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Finding the Fourth Proportional to 405,902.80, 608,854.20 and 125,419.60

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Solution

The fourth proportional to 405,902.80, 608,854.20 and 125,419.60 is: 188,129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,902.80 : 608,854.20 = 125,419.60 : x
  2. Step 2: Convert to fraction form
    405,902.80/608,854.20 = 125,419.60/x
  3. Step 3: Cross multiply
    405,902.80x = 608,854.20 × 125,419.60
  4. Step 4: Simplify right side
    405,902.80x = 76,362,250,222.32
  5. Step 5: Solve for x
    x = 76,362,250,222.32/405,902.80
  6. Step 6: Final answer
    x = 188,129.40

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1.5x scale

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.