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Finding the Fourth Proportional to 86,618.30, 129,733.05 and 71,066.30

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Solution

The fourth proportional to 86,618.30, 129,733.05 and 71,066.30 is: 106,439.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,618.30 : 129,733.05 = 71,066.30 : x
  2. Step 2: Convert to fraction form
    86,618.30/129,733.05 = 71,066.30/x
  3. Step 3: Cross multiply
    86,618.30x = 129,733.05 × 71,066.30
  4. Step 4: Simplify right side
    86,618.30x = 9,219,647,851.22
  5. Step 5: Solve for x
    x = 9,219,647,851.22/86,618.30
  6. Step 6: Final answer
    x = 106,439.95

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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.