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Finding the Fourth Proportional to 156,690.60, 235,136.70 and 86,620.20

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Solution

The fourth proportional to 156,690.60, 235,136.70 and 86,620.20 is: 129,986.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,690.60 : 235,136.70 = 86,620.20 : x
  2. Step 2: Convert to fraction form
    156,690.60/235,136.70 = 86,620.20/x
  3. Step 3: Cross multiply
    156,690.60x = 235,136.70 × 86,620.20
  4. Step 4: Simplify right side
    156,690.60x = 20,367,587,981.34
  5. Step 5: Solve for x
    x = 20,367,587,981.34/156,690.60
  6. Step 6: Final answer
    x = 129,986.02

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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.