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Finding the Fourth Proportional to 644,326.50, 889,141.78 and 386,345.84

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Solution

The fourth proportional to 644,326.50, 889,141.78 and 386,345.84 is: 533,140.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,326.50 : 889,141.78 = 386,345.84 : x
  2. Step 2: Convert to fraction form
    644,326.50/889,141.78 = 386,345.84/x
  3. Step 3: Cross multiply
    644,326.50x = 889,141.78 × 386,345.84
  4. Step 4: Simplify right side
    644,326.50x = 343,516,227,873.20
  5. Step 5: Solve for x
    x = 343,516,227,873.20/644,326.50
  6. Step 6: Final answer
    x = 533,140.00

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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.