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Finding the Fourth Proportional to 21,362, 29,478.96 and 11,801.28

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Solution

The fourth proportional to 21,362, 29,478.96 and 11,801.28 is: 16,285.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,362 : 29,478.96 = 11,801.28 : x
  2. Step 2: Convert to fraction form
    21,362/29,478.96 = 11,801.28/x
  3. Step 3: Cross multiply
    21,362x = 29,478.96 × 11,801.28
  4. Step 4: Simplify right side
    21,362x = 347,889,461.07
  5. Step 5: Solve for x
    x = 347,889,461.07/21,362
  6. Step 6: Final answer
    x = 16,285.43

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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.