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Finding the Fourth Proportional to 1,386,856, 2,079,193.72 and 931,909

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Solution

The fourth proportional to 1,386,856, 2,079,193.72 and 931,909 is: 1,397,130.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386,856 : 2,079,193.72 = 931,909 : x
  2. Step 2: Convert to fraction form
    1,386,856/2,079,193.72 = 931,909/x
  3. Step 3: Cross multiply
    1,386,856x = 2,079,193.72 × 931,909
  4. Step 4: Simplify right side
    1,386,856x = 1,937,619,340,411.48
  5. Step 5: Solve for x
    x = 1,937,619,340,411.48/1,386,856
  6. Step 6: Final answer
    x = 1,397,130.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.