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Finding the Fourth Proportional to 21,615.39, 29,829.21 and 11,679.39

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Solution

The fourth proportional to 21,615.39, 29,829.21 and 11,679.39 is: 16,117.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,615.39 : 29,829.21 = 11,679.39 : x
  2. Step 2: Convert to fraction form
    21,615.39/29,829.21 = 11,679.39/x
  3. Step 3: Cross multiply
    21,615.39x = 29,829.21 × 11,679.39
  4. Step 4: Simplify right side
    21,615.39x = 348,386,976.98
  5. Step 5: Solve for x
    x = 348,386,976.98/21,615.39
  6. Step 6: Final answer
    x = 16,117.54

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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.