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Finding the Fourth Proportional to 715,644.77, 987,564.68 and 393,352.79

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Solution

The fourth proportional to 715,644.77, 987,564.68 and 393,352.79 is: 542,813.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,644.77 : 987,564.68 = 393,352.79 : x
  2. Step 2: Convert to fraction form
    715,644.77/987,564.68 = 393,352.79/x
  3. Step 3: Cross multiply
    715,644.77x = 987,564.68 × 393,352.79
  4. Step 4: Simplify right side
    715,644.77x = 388,461,315,278.87
  5. Step 5: Solve for x
    x = 388,461,315,278.87/715,644.77
  6. Step 6: Final answer
    x = 542,813.05

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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.