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Finding the Fourth Proportional to 91,768.80, 137,739.60 and 56,776.80

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Solution

The fourth proportional to 91,768.80, 137,739.60 and 56,776.80 is: 85,218.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,768.80 : 137,739.60 = 56,776.80 : x
  2. Step 2: Convert to fraction form
    91,768.80/137,739.60 = 56,776.80/x
  3. Step 3: Cross multiply
    91,768.80x = 137,739.60 × 56,776.80
  4. Step 4: Simplify right side
    91,768.80x = 7,820,413,721.28
  5. Step 5: Solve for x
    x = 7,820,413,721.28/91,768.80
  6. Step 6: Final answer
    x = 85,218.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.