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Finding the Fourth Proportional to 136,645.83, 188,658.98 and 85,728.37

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Solution

The fourth proportional to 136,645.83, 188,658.98 and 85,728.37 is: 118,360.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,645.83 : 188,658.98 = 85,728.37 : x
  2. Step 2: Convert to fraction form
    136,645.83/188,658.98 = 85,728.37/x
  3. Step 3: Cross multiply
    136,645.83x = 188,658.98 × 85,728.37
  4. Step 4: Simplify right side
    136,645.83x = 16,173,426,841.26
  5. Step 5: Solve for x
    x = 16,173,426,841.26/136,645.83
  6. Step 6: Final answer
    x = 118,360.19

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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.