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Finding the Fourth Proportional to 21,276, 29,360.88 and 12,890.88

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Solution

The fourth proportional to 21,276, 29,360.88 and 12,890.88 is: 17,789.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,276 : 29,360.88 = 12,890.88 : x
  2. Step 2: Convert to fraction form
    21,276/29,360.88 = 12,890.88/x
  3. Step 3: Cross multiply
    21,276x = 29,360.88 × 12,890.88
  4. Step 4: Simplify right side
    21,276x = 378,487,580.77
  5. Step 5: Solve for x
    x = 378,487,580.77/21,276
  6. Step 6: Final answer
    x = 17,789.41

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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.