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Finding the Fourth Proportional to 12,479.67, 17,221.86 and 6,890.67

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Solution

The fourth proportional to 12,479.67, 17,221.86 and 6,890.67 is: 9,509.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.67 : 17,221.86 = 6,890.67 : x
  2. Step 2: Convert to fraction form
    12,479.67/17,221.86 = 6,890.67/x
  3. Step 3: Cross multiply
    12,479.67x = 17,221.86 × 6,890.67
  4. Step 4: Simplify right side
    12,479.67x = 118,670,154.05
  5. Step 5: Solve for x
    x = 118,670,154.05/12,479.67
  6. Step 6: Final answer
    x = 9,509.08

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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.