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Finding the Fourth Proportional to 8,628.45, 11,879.96 and 7,840.14

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Solution

The fourth proportional to 8,628.45, 11,879.96 and 7,840.14 is: 10,794.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,628.45 : 11,879.96 = 7,840.14 : x
  2. Step 2: Convert to fraction form
    8,628.45/11,879.96 = 7,840.14/x
  3. Step 3: Cross multiply
    8,628.45x = 11,879.96 × 7,840.14
  4. Step 4: Simplify right side
    8,628.45x = 93,140,510.39
  5. Step 5: Solve for x
    x = 93,140,510.39/8,628.45
  6. Step 6: Final answer
    x = 10,794.58

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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.