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Finding the Fourth Proportional to 391,061.63, 539,665.05 and 212,213.63

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Solution

The fourth proportional to 391,061.63, 539,665.05 and 212,213.63 is: 292,854.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,061.63 : 539,665.05 = 212,213.63 : x
  2. Step 2: Convert to fraction form
    391,061.63/539,665.05 = 212,213.63/x
  3. Step 3: Cross multiply
    391,061.63x = 539,665.05 × 212,213.63
  4. Step 4: Simplify right side
    391,061.63x = 114,524,276,546.31
  5. Step 5: Solve for x
    x = 114,524,276,546.31/391,061.63
  6. Step 6: Final answer
    x = 292,854.81

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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.