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Finding the Fourth Proportional to 11,351.90, 15,665.82 and 6,638.90

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Solution

The fourth proportional to 11,351.90, 15,665.82 and 6,638.90 is: 9,161.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,351.90 : 15,665.82 = 6,638.90 : x
  2. Step 2: Convert to fraction form
    11,351.90/15,665.82 = 6,638.90/x
  3. Step 3: Cross multiply
    11,351.90x = 15,665.82 × 6,638.90
  4. Step 4: Simplify right side
    11,351.90x = 104,003,812.40
  5. Step 5: Solve for x
    x = 104,003,812.40/11,351.90
  6. Step 6: Final answer
    x = 9,161.80

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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.