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Finding the Fourth Proportional to 136,781.60, 205,057.20 and 71,117.60

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Solution

The fourth proportional to 136,781.60, 205,057.20 and 71,117.60 is: 106,616.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,781.60 : 205,057.20 = 71,117.60 : x
  2. Step 2: Convert to fraction form
    136,781.60/205,057.20 = 71,117.60/x
  3. Step 3: Cross multiply
    136,781.60x = 205,057.20 × 71,117.60
  4. Step 4: Simplify right side
    136,781.60x = 14,583,175,926.72
  5. Step 5: Solve for x
    x = 14,583,175,926.72/136,781.60
  6. Step 6: Final answer
    x = 106,616.50

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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.