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Finding the Fourth Proportional to 21,459.65, 29,611.94 and 11,899.29

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Solution

The fourth proportional to 21,459.65, 29,611.94 and 11,899.29 is: 16,419.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,459.65 : 29,611.94 = 11,899.29 : x
  2. Step 2: Convert to fraction form
    21,459.65/29,611.94 = 11,899.29/x
  3. Step 3: Cross multiply
    21,459.65x = 29,611.94 × 11,899.29
  4. Step 4: Simplify right side
    21,459.65x = 352,361,002.03
  5. Step 5: Solve for x
    x = 352,361,002.03/21,459.65
  6. Step 6: Final answer
    x = 16,419.70

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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.