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Finding the Fourth Proportional to 21,991.40, 32,987.10 and 21,861.80

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Solution

The fourth proportional to 21,991.40, 32,987.10 and 21,861.80 is: 32,792.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.40 : 32,987.10 = 21,861.80 : x
  2. Step 2: Convert to fraction form
    21,991.40/32,987.10 = 21,861.80/x
  3. Step 3: Cross multiply
    21,991.40x = 32,987.10 × 21,861.80
  4. Step 4: Simplify right side
    21,991.40x = 721,157,382.78
  5. Step 5: Solve for x
    x = 721,157,382.78/21,991.40
  6. Step 6: Final answer
    x = 32,792.70

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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.