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Finding the Fourth Proportional to 406,390.80, 609,586.20 and 125,936.40

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Solution

The fourth proportional to 406,390.80, 609,586.20 and 125,936.40 is: 188,904.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    406,390.80 : 609,586.20 = 125,936.40 : x
  2. Step 2: Convert to fraction form
    406,390.80/609,586.20 = 125,936.40/x
  3. Step 3: Cross multiply
    406,390.80x = 609,586.20 × 125,936.40
  4. Step 4: Simplify right side
    406,390.80x = 76,769,091,517.68
  5. Step 5: Solve for x
    x = 76,769,091,517.68/406,390.80
  6. Step 6: Final answer
    x = 188,904.60

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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.