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Finding the Fourth Proportional to 21,987.69, 32,993.10 and 11,999.58

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Solution

The fourth proportional to 21,987.69, 32,993.10 and 11,999.58 is: 18,005.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.69 : 32,993.10 = 11,999.58 : x
  2. Step 2: Convert to fraction form
    21,987.69/32,993.10 = 11,999.58/x
  3. Step 3: Cross multiply
    21,987.69x = 32,993.10 × 11,999.58
  4. Step 4: Simplify right side
    21,987.69x = 395,903,342.90
  5. Step 5: Solve for x
    x = 395,903,342.90/21,987.69
  6. Step 6: Final answer
    x = 18,005.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.