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Finding the Fourth Proportional to 13,960.10, 20,911.80 and 8,678.90

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Solution

The fourth proportional to 13,960.10, 20,911.80 and 8,678.90 is: 13,000.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,960.10 : 20,911.80 = 8,678.90 : x
  2. Step 2: Convert to fraction form
    13,960.10/20,911.80 = 8,678.90/x
  3. Step 3: Cross multiply
    13,960.10x = 20,911.80 × 8,678.90
  4. Step 4: Simplify right side
    13,960.10x = 181,491,421.02
  5. Step 5: Solve for x
    x = 181,491,421.02/13,960.10
  6. Step 6: Final answer
    x = 13,000.72

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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.