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Finding the Fourth Proportional to 86,613.72, 119,581.50 and 66,431.76

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Solution

The fourth proportional to 86,613.72, 119,581.50 and 66,431.76 is: 91,717.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,613.72 : 119,581.50 = 66,431.76 : x
  2. Step 2: Convert to fraction form
    86,613.72/119,581.50 = 66,431.76/x
  3. Step 3: Cross multiply
    86,613.72x = 119,581.50 × 66,431.76
  4. Step 4: Simplify right side
    86,613.72x = 7,944,009,508.44
  5. Step 5: Solve for x
    x = 7,944,009,508.44/86,613.72
  6. Step 6: Final answer
    x = 91,717.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.