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Finding the Fourth Proportional to 1,913,216.54, 2,640,139.16 and 1,188,048.74

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Solution

The fourth proportional to 1,913,216.54, 2,640,139.16 and 1,188,048.74 is: 1,639,445.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913,216.54 : 2,640,139.16 = 1,188,048.74 : x
  2. Step 2: Convert to fraction form
    1,913,216.54/2,640,139.16 = 1,188,048.74/x
  3. Step 3: Cross multiply
    1,913,216.54x = 2,640,139.16 × 1,188,048.74
  4. Step 4: Simplify right side
    1,913,216.54x = 3,136,614,002,462.66
  5. Step 5: Solve for x
    x = 3,136,614,002,462.66/1,913,216.54
  6. Step 6: Final answer
    x = 1,639,445.37

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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.