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Finding the Fourth Proportional to 21,051.19, 29,043.86 and 13,979.01

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Solution

The fourth proportional to 21,051.19, 29,043.86 and 13,979.01 is: 19,286.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,051.19 : 29,043.86 = 13,979.01 : x
  2. Step 2: Convert to fraction form
    21,051.19/29,043.86 = 13,979.01/x
  3. Step 3: Cross multiply
    21,051.19x = 29,043.86 × 13,979.01
  4. Step 4: Simplify right side
    21,051.19x = 406,004,409.38
  5. Step 5: Solve for x
    x = 406,004,409.38/21,051.19
  6. Step 6: Final answer
    x = 19,286.53

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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.