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Finding the Fourth Proportional to 8,790, 12,135.60 and 5,651.70

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Solution

The fourth proportional to 8,790, 12,135.60 and 5,651.70 is: 7,802.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,790 : 12,135.60 = 5,651.70 : x
  2. Step 2: Convert to fraction form
    8,790/12,135.60 = 5,651.70/x
  3. Step 3: Cross multiply
    8,790x = 12,135.60 × 5,651.70
  4. Step 4: Simplify right side
    8,790x = 68,586,770.52
  5. Step 5: Solve for x
    x = 68,586,770.52/8,790
  6. Step 6: Final answer
    x = 7,802.82

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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.