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Finding the Fourth Proportional to 391,254.57, 539,923.19 and 212,406.57

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Solution

The fourth proportional to 391,254.57, 539,923.19 and 212,406.57 is: 293,116.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,254.57 : 539,923.19 = 212,406.57 : x
  2. Step 2: Convert to fraction form
    391,254.57/539,923.19 = 212,406.57/x
  3. Step 3: Cross multiply
    391,254.57x = 539,923.19 × 212,406.57
  4. Step 4: Simplify right side
    391,254.57x = 114,683,231,789.33
  5. Step 5: Solve for x
    x = 114,683,231,789.33/391,254.57
  6. Step 6: Final answer
    x = 293,116.66

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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.