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Finding the Fourth Proportional to 86,000.60, 128,957.70 and 39,200.60

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Solution

The fourth proportional to 86,000.60, 128,957.70 and 39,200.60 is: 58,781.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,000.60 : 128,957.70 = 39,200.60 : x
  2. Step 2: Convert to fraction form
    86,000.60/128,957.70 = 39,200.60/x
  3. Step 3: Cross multiply
    86,000.60x = 128,957.70 × 39,200.60
  4. Step 4: Simplify right side
    86,000.60x = 5,055,219,214.62
  5. Step 5: Solve for x
    x = 5,055,219,214.62/86,000.60
  6. Step 6: Final answer
    x = 58,781.21

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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.