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Finding the Fourth Proportional to 12,778.66, 17,630.49 and 7,188.58

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Solution

The fourth proportional to 12,778.66, 17,630.49 and 7,188.58 is: 9,917.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,778.66 : 17,630.49 = 7,188.58 : x
  2. Step 2: Convert to fraction form
    12,778.66/17,630.49 = 7,188.58/x
  3. Step 3: Cross multiply
    12,778.66x = 17,630.49 × 7,188.58
  4. Step 4: Simplify right side
    12,778.66x = 126,738,187.80
  5. Step 5: Solve for x
    x = 126,738,187.80/12,778.66
  6. Step 6: Final answer
    x = 9,917.96

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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.