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Finding the Fourth Proportional to 715,541.28, 987,470.64 and 393,262.80

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Solution

The fourth proportional to 715,541.28, 987,470.64 and 393,262.80 is: 542,715.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,541.28 : 987,470.64 = 393,262.80 : x
  2. Step 2: Convert to fraction form
    715,541.28/987,470.64 = 393,262.80/x
  3. Step 3: Cross multiply
    715,541.28x = 987,470.64 × 393,262.80
  4. Step 4: Simplify right side
    715,541.28x = 388,335,468,804.19
  5. Step 5: Solve for x
    x = 388,335,468,804.19/715,541.28
  6. Step 6: Final answer
    x = 542,715.68

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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.