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Finding the Fourth Proportional to 438,728.60, 605,389.81 and 257,374.36

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Solution

The fourth proportional to 438,728.60, 605,389.81 and 257,374.36 is: 355,143.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,728.60 : 605,389.81 = 257,374.36 : x
  2. Step 2: Convert to fraction form
    438,728.60/605,389.81 = 257,374.36/x
  3. Step 3: Cross multiply
    438,728.60x = 605,389.81 × 257,374.36
  4. Step 4: Simplify right side
    438,728.60x = 155,811,814,899.27
  5. Step 5: Solve for x
    x = 155,811,814,899.27/438,728.60
  6. Step 6: Final answer
    x = 355,143.97

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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.