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Finding the Fourth Proportional to 11,861.70, 17,792.55 and 8,581.20

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Solution

The fourth proportional to 11,861.70, 17,792.55 and 8,581.20 is: 12,871.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,861.70 : 17,792.55 = 8,581.20 : x
  2. Step 2: Convert to fraction form
    11,861.70/17,792.55 = 8,581.20/x
  3. Step 3: Cross multiply
    11,861.70x = 17,792.55 × 8,581.20
  4. Step 4: Simplify right side
    11,861.70x = 152,681,430.06
  5. Step 5: Solve for x
    x = 152,681,430.06/11,861.70
  6. Step 6: Final answer
    x = 12,871.80

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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.