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Finding the Fourth Proportional to 86,008.79, 128,954.31 and 43,807.18

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Solution

The fourth proportional to 86,008.79, 128,954.31 and 43,807.18 is: 65,680.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,008.79 : 128,954.31 = 43,807.18 : x
  2. Step 2: Convert to fraction form
    86,008.79/128,954.31 = 43,807.18/x
  3. Step 3: Cross multiply
    86,008.79x = 128,954.31 × 43,807.18
  4. Step 4: Simplify right side
    86,008.79x = 5,649,124,669.95
  5. Step 5: Solve for x
    x = 5,649,124,669.95/86,008.79
  6. Step 6: Final answer
    x = 65,680.78

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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.