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Finding the Fourth Proportional to 8,391.20, 11,572.80 and 7,068

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Solution

The fourth proportional to 8,391.20, 11,572.80 and 7,068 is: 9,747.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.20 : 11,572.80 = 7,068 : x
  2. Step 2: Convert to fraction form
    8,391.20/11,572.80 = 7,068/x
  3. Step 3: Cross multiply
    8,391.20x = 11,572.80 × 7,068
  4. Step 4: Simplify right side
    8,391.20x = 81,796,550.40
  5. Step 5: Solve for x
    x = 81,796,550.40/8,391.20
  6. Step 6: Final answer
    x = 9,747.90

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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.