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Finding the Fourth Proportional to 12,409.76, 17,128.08 and 7,869.50

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Solution

The fourth proportional to 12,409.76, 17,128.08 and 7,869.50 is: 10,861.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,409.76 : 17,128.08 = 7,869.50 : x
  2. Step 2: Convert to fraction form
    12,409.76/17,128.08 = 7,869.50/x
  3. Step 3: Cross multiply
    12,409.76x = 17,128.08 × 7,869.50
  4. Step 4: Simplify right side
    12,409.76x = 134,789,425.56
  5. Step 5: Solve for x
    x = 134,789,425.56/12,409.76
  6. Step 6: Final answer
    x = 10,861.57

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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.