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Finding the Fourth Proportional to 21,687.70, 29,929.25 and 12,735.36

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Solution

The fourth proportional to 21,687.70, 29,929.25 and 12,735.36 is: 17,574.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.70 : 29,929.25 = 12,735.36 : x
  2. Step 2: Convert to fraction form
    21,687.70/29,929.25 = 12,735.36/x
  3. Step 3: Cross multiply
    21,687.70x = 29,929.25 × 12,735.36
  4. Step 4: Simplify right side
    21,687.70x = 381,159,773.28
  5. Step 5: Solve for x
    x = 381,159,773.28/21,687.70
  6. Step 6: Final answer
    x = 17,574.93

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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.