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Finding the Fourth Proportional to 21,660.80, 29,905.80 and 17,691.44

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Solution

The fourth proportional to 21,660.80, 29,905.80 and 17,691.44 is: 24,425.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,660.80 : 29,905.80 = 17,691.44 : x
  2. Step 2: Convert to fraction form
    21,660.80/29,905.80 = 17,691.44/x
  3. Step 3: Cross multiply
    21,660.80x = 29,905.80 × 17,691.44
  4. Step 4: Simplify right side
    21,660.80x = 529,076,666.35
  5. Step 5: Solve for x
    x = 529,076,666.35/21,660.80
  6. Step 6: Final answer
    x = 24,425.54

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1.5x scale

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.