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Finding the Fourth Proportional to 18,630.76, 25,721.40 and 11,561.08

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Solution

The fourth proportional to 18,630.76, 25,721.40 and 11,561.08 is: 15,961.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,630.76 : 25,721.40 = 11,561.08 : x
  2. Step 2: Convert to fraction form
    18,630.76/25,721.40 = 11,561.08/x
  3. Step 3: Cross multiply
    18,630.76x = 25,721.40 × 11,561.08
  4. Step 4: Simplify right side
    18,630.76x = 297,367,163.11
  5. Step 5: Solve for x
    x = 297,367,163.11/18,630.76
  6. Step 6: Final answer
    x = 15,961.09

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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.