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Finding the Fourth Proportional to 21,611.97, 29,828.40 and 12,658.95

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Solution

The fourth proportional to 21,611.97, 29,828.40 and 12,658.95 is: 17,471.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,611.97 : 29,828.40 = 12,658.95 : x
  2. Step 2: Convert to fraction form
    21,611.97/29,828.40 = 12,658.95/x
  3. Step 3: Cross multiply
    21,611.97x = 29,828.40 × 12,658.95
  4. Step 4: Simplify right side
    21,611.97x = 377,596,224.18
  5. Step 5: Solve for x
    x = 377,596,224.18/21,611.97
  6. Step 6: Final answer
    x = 17,471.62

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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.