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Finding the Fourth Proportional to 8,607.78, 11,867.36 and 5,618.40

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Solution

The fourth proportional to 8,607.78, 11,867.36 and 5,618.40 is: 7,745.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,607.78 : 11,867.36 = 5,618.40 : x
  2. Step 2: Convert to fraction form
    8,607.78/11,867.36 = 5,618.40/x
  3. Step 3: Cross multiply
    8,607.78x = 11,867.36 × 5,618.40
  4. Step 4: Simplify right side
    8,607.78x = 66,675,575.42
  5. Step 5: Solve for x
    x = 66,675,575.42/8,607.78
  6. Step 6: Final answer
    x = 7,745.97

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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.