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Finding the Fourth Proportional to 18,620.76, 25,695.72 and 10,661.16

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Solution

The fourth proportional to 18,620.76, 25,695.72 and 10,661.16 is: 14,711.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,620.76 : 25,695.72 = 10,661.16 : x
  2. Step 2: Convert to fraction form
    18,620.76/25,695.72 = 10,661.16/x
  3. Step 3: Cross multiply
    18,620.76x = 25,695.72 × 10,661.16
  4. Step 4: Simplify right side
    18,620.76x = 273,946,182.24
  5. Step 5: Solve for x
    x = 273,946,182.24/18,620.76
  6. Step 6: Final answer
    x = 14,711.87

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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.