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Finding the Fourth Proportional to 86,019.60, 128,986.20 and 39,219.60

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Solution

The fourth proportional to 86,019.60, 128,986.20 and 39,219.60 is: 58,809.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,019.60 : 128,986.20 = 39,219.60 : x
  2. Step 2: Convert to fraction form
    86,019.60/128,986.20 = 39,219.60/x
  3. Step 3: Cross multiply
    86,019.60x = 128,986.20 × 39,219.60
  4. Step 4: Simplify right side
    86,019.60x = 5,058,787,169.52
  5. Step 5: Solve for x
    x = 5,058,787,169.52/86,019.60
  6. Step 6: Final answer
    x = 58,809.70

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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.