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Finding the Fourth Proportional to 644,326.76, 889,142.15 and 386,346.11

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Solution

The fourth proportional to 644,326.76, 889,142.15 and 386,346.11 is: 533,140.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,326.76 : 889,142.15 = 386,346.11 : x
  2. Step 2: Convert to fraction form
    644,326.76/889,142.15 = 386,346.11/x
  3. Step 3: Cross multiply
    644,326.76x = 889,142.15 × 386,346.11
  4. Step 4: Simplify right side
    644,326.76x = 343,516,610,889.54
  5. Step 5: Solve for x
    x = 343,516,610,889.54/644,326.76
  6. Step 6: Final answer
    x = 533,140.38

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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.