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Finding the Fourth Proportional to 21,665.92, 32,429.44 and 11,656.64

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Solution

The fourth proportional to 21,665.92, 32,429.44 and 11,656.64 is: 17,447.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,665.92 : 32,429.44 = 11,656.64 : x
  2. Step 2: Convert to fraction form
    21,665.92/32,429.44 = 11,656.64/x
  3. Step 3: Cross multiply
    21,665.92x = 32,429.44 × 11,656.64
  4. Step 4: Simplify right side
    21,665.92x = 378,018,307.48
  5. Step 5: Solve for x
    x = 378,018,307.48/21,665.92
  6. Step 6: Final answer
    x = 17,447.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.