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Finding the Fourth Proportional to 8,959.91, 13,438.11 and 8,515.39

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Solution

The fourth proportional to 8,959.91, 13,438.11 and 8,515.39 is: 12,771.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,959.91 : 13,438.11 = 8,515.39 : x
  2. Step 2: Convert to fraction form
    8,959.91/13,438.11 = 8,515.39/x
  3. Step 3: Cross multiply
    8,959.91x = 13,438.11 × 8,515.39
  4. Step 4: Simplify right side
    8,959.91x = 114,430,747.51
  5. Step 5: Solve for x
    x = 114,430,747.51/8,959.91
  6. Step 6: Final answer
    x = 12,771.42

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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.