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Finding the Fourth Proportional to 21,064.32, 29,064.96 and 13,608

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Solution

The fourth proportional to 21,064.32, 29,064.96 and 13,608 is: 18,776.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,064.32 : 29,064.96 = 13,608 : x
  2. Step 2: Convert to fraction form
    21,064.32/29,064.96 = 13,608/x
  3. Step 3: Cross multiply
    21,064.32x = 29,064.96 × 13,608
  4. Step 4: Simplify right side
    21,064.32x = 395,515,975.68
  5. Step 5: Solve for x
    x = 395,515,975.68/21,064.32
  6. Step 6: Final answer
    x = 18,776.58

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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.