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Finding the Fourth Proportional to 21,645.98, 29,871.60 and 12,693.66

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Solution

The fourth proportional to 21,645.98, 29,871.60 and 12,693.66 is: 17,517.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,645.98 : 29,871.60 = 12,693.66 : x
  2. Step 2: Convert to fraction form
    21,645.98/29,871.60 = 12,693.66/x
  3. Step 3: Cross multiply
    21,645.98x = 29,871.60 × 12,693.66
  4. Step 4: Simplify right side
    21,645.98x = 379,179,934.06
  5. Step 5: Solve for x
    x = 379,179,934.06/21,645.98
  6. Step 6: Final answer
    x = 17,517.34

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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.