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Finding the Fourth Proportional to 123,987.40, 185,981.10 and 86,662.60

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Solution

The fourth proportional to 123,987.40, 185,981.10 and 86,662.60 is: 129,993.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,987.40 : 185,981.10 = 86,662.60 : x
  2. Step 2: Convert to fraction form
    123,987.40/185,981.10 = 86,662.60/x
  3. Step 3: Cross multiply
    123,987.40x = 185,981.10 × 86,662.60
  4. Step 4: Simplify right side
    123,987.40x = 16,117,605,676.86
  5. Step 5: Solve for x
    x = 16,117,605,676.86/123,987.40
  6. Step 6: Final answer
    x = 129,993.90

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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.