Home / 13,117.12-18,089.76-8,639.44

Finding the Fourth Proportional to 13,117.12, 18,089.76 and 8,639.44

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Solution

The fourth proportional to 13,117.12, 18,089.76 and 8,639.44 is: 11,914.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,117.12 : 18,089.76 = 8,639.44 : x
  2. Step 2: Convert to fraction form
    13,117.12/18,089.76 = 8,639.44/x
  3. Step 3: Cross multiply
    13,117.12x = 18,089.76 × 8,639.44
  4. Step 4: Simplify right side
    13,117.12x = 156,285,396.13
  5. Step 5: Solve for x
    x = 156,285,396.13/13,117.12
  6. Step 6: Final answer
    x = 11,914.61

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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.