Home / 809,138.40-1,213,707.60-411,007.20

Finding the Fourth Proportional to 809,138.40, 1,213,707.60 and 411,007.20

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Solution

The fourth proportional to 809,138.40, 1,213,707.60 and 411,007.20 is: 616,510.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,138.40 : 1,213,707.60 = 411,007.20 : x
  2. Step 2: Convert to fraction form
    809,138.40/1,213,707.60 = 411,007.20/x
  3. Step 3: Cross multiply
    809,138.40x = 1,213,707.60 × 411,007.20
  4. Step 4: Simplify right side
    809,138.40x = 498,842,562,294.72
  5. Step 5: Solve for x
    x = 498,842,562,294.72/809,138.40
  6. Step 6: Final answer
    x = 616,510.80

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Double scale
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Similar ratio
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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.