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Finding the Fourth Proportional to 86,016.60, 128,981.70 and 39,216.60

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Solution

The fourth proportional to 86,016.60, 128,981.70 and 39,216.60 is: 58,805.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,016.60 : 128,981.70 = 39,216.60 : x
  2. Step 2: Convert to fraction form
    86,016.60/128,981.70 = 39,216.60/x
  3. Step 3: Cross multiply
    86,016.60x = 128,981.70 × 39,216.60
  4. Step 4: Simplify right side
    86,016.60x = 5,058,223,736.22
  5. Step 5: Solve for x
    x = 5,058,223,736.22/86,016.60
  6. Step 6: Final answer
    x = 58,805.20

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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.