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Finding the Fourth Proportional to 8,661.40, 12,992.20 and 3,118.70

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Solution

The fourth proportional to 8,661.40, 12,992.20 and 3,118.70 is: 4,678.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,661.40 : 12,992.20 = 3,118.70 : x
  2. Step 2: Convert to fraction form
    8,661.40/12,992.20 = 3,118.70/x
  3. Step 3: Cross multiply
    8,661.40x = 12,992.20 × 3,118.70
  4. Step 4: Simplify right side
    8,661.40x = 40,518,774.14
  5. Step 5: Solve for x
    x = 40,518,774.14/8,661.40
  6. Step 6: Final answer
    x = 4,678.09

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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.