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Finding the Fourth Proportional to 231,408.45, 319,360.01 and 129,443.45

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Solution

The fourth proportional to 231,408.45, 319,360.01 and 129,443.45 is: 178,641.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,408.45 : 319,360.01 = 129,443.45 : x
  2. Step 2: Convert to fraction form
    231,408.45/319,360.01 = 129,443.45/x
  3. Step 3: Cross multiply
    231,408.45x = 319,360.01 × 129,443.45
  4. Step 4: Simplify right side
    231,408.45x = 41,339,061,486.43
  5. Step 5: Solve for x
    x = 41,339,061,486.43/231,408.45
  6. Step 6: Final answer
    x = 178,641.11

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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.