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Finding the Fourth Proportional to 644,332.40, 889,149.92 and 386,351.72

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Solution

The fourth proportional to 644,332.40, 889,149.92 and 386,351.72 is: 533,148.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,332.40 : 889,149.92 = 386,351.72 : x
  2. Step 2: Convert to fraction form
    644,332.40/889,149.92 = 386,351.72/x
  3. Step 3: Cross multiply
    644,332.40x = 889,149.92 × 386,351.72
  4. Step 4: Simplify right side
    644,332.40x = 343,524,600,929.86
  5. Step 5: Solve for x
    x = 343,524,600,929.86/644,332.40
  6. Step 6: Final answer
    x = 533,148.11

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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.