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Finding the Fourth Proportional to 85,995.36, 128,294.64 and 81,345.06

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Solution

The fourth proportional to 85,995.36, 128,294.64 and 81,345.06 is: 121,356.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,995.36 : 128,294.64 = 81,345.06 : x
  2. Step 2: Convert to fraction form
    85,995.36/128,294.64 = 81,345.06/x
  3. Step 3: Cross multiply
    85,995.36x = 128,294.64 × 81,345.06
  4. Step 4: Simplify right side
    85,995.36x = 10,436,135,188.48
  5. Step 5: Solve for x
    x = 10,436,135,188.48/85,995.36
  6. Step 6: Final answer
    x = 121,356.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.