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Finding the Fourth Proportional to 718,692.53, 991,807.61 and 392,005.65

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Solution

The fourth proportional to 718,692.53, 991,807.61 and 392,005.65 is: 540,974.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,692.53 : 991,807.61 = 392,005.65 : x
  2. Step 2: Convert to fraction form
    718,692.53/991,807.61 = 392,005.65/x
  3. Step 3: Cross multiply
    718,692.53x = 991,807.61 × 392,005.65
  4. Step 4: Simplify right side
    718,692.53x = 388,794,186,833.00
  5. Step 5: Solve for x
    x = 388,794,186,833.00/718,692.53
  6. Step 6: Final answer
    x = 540,974.30

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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.