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Finding the Fourth Proportional to 21,615.75, 29,829.74 and 11,679.75

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Solution

The fourth proportional to 21,615.75, 29,829.74 and 11,679.75 is: 16,118.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,615.75 : 29,829.74 = 11,679.75 : x
  2. Step 2: Convert to fraction form
    21,615.75/29,829.74 = 11,679.75/x
  3. Step 3: Cross multiply
    21,615.75x = 29,829.74 × 11,679.75
  4. Step 4: Simplify right side
    21,615.75x = 348,403,847.37
  5. Step 5: Solve for x
    x = 348,403,847.37/21,615.75
  6. Step 6: Final answer
    x = 16,118.06

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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.