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Finding the Fourth Proportional to 21,655.50, 29,884.61 and 11,719.50

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Solution

The fourth proportional to 21,655.50, 29,884.61 and 11,719.50 is: 16,172.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,655.50 : 29,884.61 = 11,719.50 : x
  2. Step 2: Convert to fraction form
    21,655.50/29,884.61 = 11,719.50/x
  3. Step 3: Cross multiply
    21,655.50x = 29,884.61 × 11,719.50
  4. Step 4: Simplify right side
    21,655.50x = 350,232,628.30
  5. Step 5: Solve for x
    x = 350,232,628.30/21,655.50
  6. Step 6: Final answer
    x = 16,172.92

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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.