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Finding the Fourth Proportional to 19,658.65, 27,129.12 and 11,160.55

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Solution

The fourth proportional to 19,658.65, 27,129.12 and 11,160.55 is: 15,401.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,658.65 : 27,129.12 = 11,160.55 : x
  2. Step 2: Convert to fraction form
    19,658.65/27,129.12 = 11,160.55/x
  3. Step 3: Cross multiply
    19,658.65x = 27,129.12 × 11,160.55
  4. Step 4: Simplify right side
    19,658.65x = 302,775,900.22
  5. Step 5: Solve for x
    x = 302,775,900.22/19,658.65
  6. Step 6: Final answer
    x = 15,401.66

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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.