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Finding the Fourth Proportional to 18,421.12, 27,608.58 and 7,878.76

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Solution

The fourth proportional to 18,421.12, 27,608.58 and 7,878.76 is: 11,808.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.12 : 27,608.58 = 7,878.76 : x
  2. Step 2: Convert to fraction form
    18,421.12/27,608.58 = 7,878.76/x
  3. Step 3: Cross multiply
    18,421.12x = 27,608.58 × 7,878.76
  4. Step 4: Simplify right side
    18,421.12x = 217,521,375.76
  5. Step 5: Solve for x
    x = 217,521,375.76/18,421.12
  6. Step 6: Final answer
    x = 11,808.26

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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.