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Finding the Fourth Proportional to 21,272, 29,355.36 and 11,840.36

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Solution

The fourth proportional to 21,272, 29,355.36 and 11,840.36 is: 16,339.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,272 : 29,355.36 = 11,840.36 : x
  2. Step 2: Convert to fraction form
    21,272/29,355.36 = 11,840.36/x
  3. Step 3: Cross multiply
    21,272x = 29,355.36 × 11,840.36
  4. Step 4: Simplify right side
    21,272x = 347,578,030.33
  5. Step 5: Solve for x
    x = 347,578,030.33/21,272
  6. Step 6: Final answer
    x = 16,339.70

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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.