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Finding the Fourth Proportional to 86,111.80, 128,937.30 and 54,777.40

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Solution

The fourth proportional to 86,111.80, 128,937.30 and 54,777.40 is: 82,019.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,111.80 : 128,937.30 = 54,777.40 : x
  2. Step 2: Convert to fraction form
    86,111.80/128,937.30 = 54,777.40/x
  3. Step 3: Cross multiply
    86,111.80x = 128,937.30 × 54,777.40
  4. Step 4: Simplify right side
    86,111.80x = 7,062,850,057.02
  5. Step 5: Solve for x
    x = 7,062,850,057.02/86,111.80
  6. Step 6: Final answer
    x = 82,019.54

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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.