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Finding the Fourth Proportional to 18,307.20, 25,257.60 and 10,857.60

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Solution

The fourth proportional to 18,307.20, 25,257.60 and 10,857.60 is: 14,979.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,307.20 : 25,257.60 = 10,857.60 : x
  2. Step 2: Convert to fraction form
    18,307.20/25,257.60 = 10,857.60/x
  3. Step 3: Cross multiply
    18,307.20x = 25,257.60 × 10,857.60
  4. Step 4: Simplify right side
    18,307.20x = 274,236,917.76
  5. Step 5: Solve for x
    x = 274,236,917.76/18,307.20
  6. Step 6: Final answer
    x = 14,979.73

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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.