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Finding the Fourth Proportional to 21,396.48, 32,100.76 and 18,739.24

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Solution

The fourth proportional to 21,396.48, 32,100.76 and 18,739.24 is: 28,114.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,396.48 : 32,100.76 = 18,739.24 : x
  2. Step 2: Convert to fraction form
    21,396.48/32,100.76 = 18,739.24/x
  3. Step 3: Cross multiply
    21,396.48x = 32,100.76 × 18,739.24
  4. Step 4: Simplify right side
    21,396.48x = 601,543,845.82
  5. Step 5: Solve for x
    x = 601,543,845.82/21,396.48
  6. Step 6: Final answer
    x = 28,114.15

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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.