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Finding the Fourth Proportional to 719,339.90, 992,713.11 and 392,672.30

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Solution

The fourth proportional to 719,339.90, 992,713.11 and 392,672.30 is: 541,900.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,339.90 : 992,713.11 = 392,672.30 : x
  2. Step 2: Convert to fraction form
    719,339.90/992,713.11 = 392,672.30/x
  3. Step 3: Cross multiply
    719,339.90x = 992,713.11 × 392,672.30
  4. Step 4: Simplify right side
    719,339.90x = 389,810,940,143.85
  5. Step 5: Solve for x
    x = 389,810,940,143.85/719,339.90
  6. Step 6: Final answer
    x = 541,900.90

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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.