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Finding the Fourth Proportional to 21,672.26, 29,904.08 and 13,172.92

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Solution

The fourth proportional to 21,672.26, 29,904.08 and 13,172.92 is: 18,176.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,672.26 : 29,904.08 = 13,172.92 : x
  2. Step 2: Convert to fraction form
    21,672.26/29,904.08 = 13,172.92/x
  3. Step 3: Cross multiply
    21,672.26x = 29,904.08 × 13,172.92
  4. Step 4: Simplify right side
    21,672.26x = 393,924,053.51
  5. Step 5: Solve for x
    x = 393,924,053.51/21,672.26
  6. Step 6: Final answer
    x = 18,176.42

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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.