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Finding the Fourth Proportional to 18,679.64, 25,780.74 and 10,615.64

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Solution

The fourth proportional to 18,679.64, 25,780.74 and 10,615.64 is: 14,651.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.64 : 25,780.74 = 10,615.64 : x
  2. Step 2: Convert to fraction form
    18,679.64/25,780.74 = 10,615.64/x
  3. Step 3: Cross multiply
    18,679.64x = 25,780.74 × 10,615.64
  4. Step 4: Simplify right side
    18,679.64x = 273,679,054.77
  5. Step 5: Solve for x
    x = 273,679,054.77/18,679.64
  6. Step 6: Final answer
    x = 14,651.20

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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.