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Finding the Fourth Proportional to 12,609.30, 18,908.55 and 5,211.30

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Solution

The fourth proportional to 12,609.30, 18,908.55 and 5,211.30 is: 7,814.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,609.30 : 18,908.55 = 5,211.30 : x
  2. Step 2: Convert to fraction form
    12,609.30/18,908.55 = 5,211.30/x
  3. Step 3: Cross multiply
    12,609.30x = 18,908.55 × 5,211.30
  4. Step 4: Simplify right side
    12,609.30x = 98,538,126.62
  5. Step 5: Solve for x
    x = 98,538,126.62/12,609.30
  6. Step 6: Final answer
    x = 7,814.72

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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.