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Finding the Fourth Proportional to 15,172.60, 20,935.64 and 8,456.76

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Solution

The fourth proportional to 15,172.60, 20,935.64 and 8,456.76 is: 11,668.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,172.60 : 20,935.64 = 8,456.76 : x
  2. Step 2: Convert to fraction form
    15,172.60/20,935.64 = 8,456.76/x
  3. Step 3: Cross multiply
    15,172.60x = 20,935.64 × 8,456.76
  4. Step 4: Simplify right side
    15,172.60x = 177,047,682.93
  5. Step 5: Solve for x
    x = 177,047,682.93/15,172.60
  6. Step 6: Final answer
    x = 11,668.91

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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.