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Finding the Fourth Proportional to 21,911.31, 32,817.76 and 21,173.20

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Solution

The fourth proportional to 21,911.31, 32,817.76 and 21,173.20 is: 31,712.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,911.31 : 32,817.76 = 21,173.20 : x
  2. Step 2: Convert to fraction form
    21,911.31/32,817.76 = 21,173.20/x
  3. Step 3: Cross multiply
    21,911.31x = 32,817.76 × 21,173.20
  4. Step 4: Simplify right side
    21,911.31x = 694,856,861.05
  5. Step 5: Solve for x
    x = 694,856,861.05/21,911.31
  6. Step 6: Final answer
    x = 31,712.25

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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.