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Finding the Fourth Proportional to 153,896.78, 212,376.72 and 85,909.82

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Solution

The fourth proportional to 153,896.78, 212,376.72 and 85,909.82 is: 118,555.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,896.78 : 212,376.72 = 85,909.82 : x
  2. Step 2: Convert to fraction form
    153,896.78/212,376.72 = 85,909.82/x
  3. Step 3: Cross multiply
    153,896.78x = 212,376.72 × 85,909.82
  4. Step 4: Simplify right side
    153,896.78x = 18,245,245,787.39
  5. Step 5: Solve for x
    x = 18,245,245,787.39/153,896.78
  6. Step 6: Final answer
    x = 118,555.08

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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.