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Finding the Fourth Proportional to 21,655.70, 29,884.94 and 11,719.70

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Solution

The fourth proportional to 21,655.70, 29,884.94 and 11,719.70 is: 16,173.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,655.70 : 29,884.94 = 11,719.70 : x
  2. Step 2: Convert to fraction form
    21,655.70/29,884.94 = 11,719.70/x
  3. Step 3: Cross multiply
    21,655.70x = 29,884.94 × 11,719.70
  4. Step 4: Simplify right side
    21,655.70x = 350,242,323.29
  5. Step 5: Solve for x
    x = 350,242,323.29/21,655.70
  6. Step 6: Final answer
    x = 16,173.22

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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.