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Finding the Fourth Proportional to 641,745.47, 885,330.67 and 386,955.11

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Solution

The fourth proportional to 641,745.47, 885,330.67 and 386,955.11 is: 533,830.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,745.47 : 885,330.67 = 386,955.11 : x
  2. Step 2: Convert to fraction form
    641,745.47/885,330.67 = 386,955.11/x
  3. Step 3: Cross multiply
    641,745.47x = 885,330.67 × 386,955.11
  4. Step 4: Simplify right side
    641,745.47x = 342,583,226,796.22
  5. Step 5: Solve for x
    x = 342,583,226,796.22/641,745.47
  6. Step 6: Final answer
    x = 533,830.38

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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.