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Finding the Fourth Proportional to 7,890.36, 10,879.02 and 6,392.76

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Solution

The fourth proportional to 7,890.36, 10,879.02 and 6,392.76 is: 8,814.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890.36 : 10,879.02 = 6,392.76 : x
  2. Step 2: Convert to fraction form
    7,890.36/10,879.02 = 6,392.76/x
  3. Step 3: Cross multiply
    7,890.36x = 10,879.02 × 6,392.76
  4. Step 4: Simplify right side
    7,890.36x = 69,546,963.90
  5. Step 5: Solve for x
    x = 69,546,963.90/7,890.36
  6. Step 6: Final answer
    x = 8,814.17

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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.