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Finding the Fourth Proportional to 8,631.90, 11,906.89 and 5,443.90

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Solution

The fourth proportional to 8,631.90, 11,906.89 and 5,443.90 is: 7,509.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,631.90 : 11,906.89 = 5,443.90 : x
  2. Step 2: Convert to fraction form
    8,631.90/11,906.89 = 5,443.90/x
  3. Step 3: Cross multiply
    8,631.90x = 11,906.89 × 5,443.90
  4. Step 4: Simplify right side
    8,631.90x = 64,819,918.47
  5. Step 5: Solve for x
    x = 64,819,918.47/8,631.90
  6. Step 6: Final answer
    x = 7,509.35

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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.