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Finding the Fourth Proportional to 8,690.39, 11,989.71 and 5,330.60

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Solution

The fourth proportional to 8,690.39, 11,989.71 and 5,330.60 is: 7,354.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.39 : 11,989.71 = 5,330.60 : x
  2. Step 2: Convert to fraction form
    8,690.39/11,989.71 = 5,330.60/x
  3. Step 3: Cross multiply
    8,690.39x = 11,989.71 × 5,330.60
  4. Step 4: Simplify right side
    8,690.39x = 63,912,348.13
  5. Step 5: Solve for x
    x = 63,912,348.13/8,690.39
  6. Step 6: Final answer
    x = 7,354.37

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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.