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Finding the Fourth Proportional to 21,655.78, 29,884.98 and 11,719.78

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Solution

The fourth proportional to 21,655.78, 29,884.98 and 11,719.78 is: 16,173.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,655.78 : 29,884.98 = 11,719.78 : x
  2. Step 2: Convert to fraction form
    21,655.78/29,884.98 = 11,719.78/x
  3. Step 3: Cross multiply
    21,655.78x = 29,884.98 × 11,719.78
  4. Step 4: Simplify right side
    21,655.78x = 350,245,428.26
  5. Step 5: Solve for x
    x = 350,245,428.26/21,655.78
  6. Step 6: Final answer
    x = 16,173.30

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1.5x scale

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.