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Finding the Fourth Proportional to 21,699.92, 29,948.12 and 13,202.64

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Solution

The fourth proportional to 21,699.92, 29,948.12 and 13,202.64 is: 18,221.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,699.92 : 29,948.12 = 13,202.64 : x
  2. Step 2: Convert to fraction form
    21,699.92/29,948.12 = 13,202.64/x
  3. Step 3: Cross multiply
    21,699.92x = 29,948.12 × 13,202.64
  4. Step 4: Simplify right side
    21,699.92x = 395,394,181.02
  5. Step 5: Solve for x
    x = 395,394,181.02/21,699.92
  6. Step 6: Final answer
    x = 18,221.00

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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.