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Finding the Fourth Proportional to 13,885.59, 20,815.02 and 5,115.72

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Solution

The fourth proportional to 13,885.59, 20,815.02 and 5,115.72 is: 7,668.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,885.59 : 20,815.02 = 5,115.72 : x
  2. Step 2: Convert to fraction form
    13,885.59/20,815.02 = 5,115.72/x
  3. Step 3: Cross multiply
    13,885.59x = 20,815.02 × 5,115.72
  4. Step 4: Simplify right side
    13,885.59x = 106,483,814.11
  5. Step 5: Solve for x
    x = 106,483,814.11/13,885.59
  6. Step 6: Final answer
    x = 7,668.66

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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.