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Finding the Fourth Proportional to 13,615.90, 18,788.49 and 7,648.22

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Solution

The fourth proportional to 13,615.90, 18,788.49 and 7,648.22 is: 10,553.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.90 : 18,788.49 = 7,648.22 : x
  2. Step 2: Convert to fraction form
    13,615.90/18,788.49 = 7,648.22/x
  3. Step 3: Cross multiply
    13,615.90x = 18,788.49 × 7,648.22
  4. Step 4: Simplify right side
    13,615.90x = 143,698,551.96
  5. Step 5: Solve for x
    x = 143,698,551.96/13,615.90
  6. Step 6: Final answer
    x = 10,553.73

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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.