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Finding the Fourth Proportional to 611,605.36, 843,986.76 and 339,690.80

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Solution

The fourth proportional to 611,605.36, 843,986.76 and 339,690.80 is: 468,757.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,605.36 : 843,986.76 = 339,690.80 : x
  2. Step 2: Convert to fraction form
    611,605.36/843,986.76 = 339,690.80/x
  3. Step 3: Cross multiply
    611,605.36x = 843,986.76 × 339,690.80
  4. Step 4: Simplify right side
    611,605.36x = 286,694,537,693.81
  5. Step 5: Solve for x
    x = 286,694,537,693.81/611,605.36
  6. Step 6: Final answer
    x = 468,757.40

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.