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Finding the Fourth Proportional to 18,518.40, 27,786.44 and 8,656.25

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Solution

The fourth proportional to 18,518.40, 27,786.44 and 8,656.25 is: 12,988.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,518.40 : 27,786.44 = 8,656.25 : x
  2. Step 2: Convert to fraction form
    18,518.40/27,786.44 = 8,656.25/x
  3. Step 3: Cross multiply
    18,518.40x = 27,786.44 × 8,656.25
  4. Step 4: Simplify right side
    18,518.40x = 240,526,253.96
  5. Step 5: Solve for x
    x = 240,526,253.96/18,518.40
  6. Step 6: Final answer
    x = 12,988.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.